http://7search.com – cheap search/direct domain ads

http://accelerator-media.com – UK banners/media buys

http://ad.ly/ – more twitter ads

http://ad2onegroup.com – media buys on premium UK, Irish & Aus. sites Ebay UK

http://adblade.com – self serve display ads, very good service

http://adbrite.com – display/contextual ads

http://adperium.com/directads – display banners, self serve, similar to adbrite

http://adready.yahoo.com – display ads/self serve banners on yahoo sites

http://adroll.com – self serve banners

http://adsdaq.com – banners/media buying exchange

http://adside.com – self serve ppc contextual inline text ads

http://adsonar.com – text ads on high traffic US site

http://adtegrity.com – Media buys/display, high volume

http://adtoll.com – banners/display/text ads, adbrite clone, cheap

http://adtoll.com – self serve banners etc, similar to adbrite

http://adverline.com – Media buys, good French/Euro inventory

http://advertise.com – self serve text, search and display ads

http://advertise.myspace.com – self serve banners on myspace

http://advertisers.federatedmedia.net – cpm banners on good inventory of sites

http://advertising.aol.com – variety of solutions on AOL inventory

http://advertising.com – display/benners, media buys

http://advertising.ezanga.com – cheaper search and contextual

http://advertising.microsoft.com/ad-network – microsoft banner display/media buys

http://affinity.com – search, parked pages, text ads – good 2nd tier inventory

http://aim4media.com – Display media buys, European traffic

http://ampkeywords.com – self serve text ads

http://appvert.com – farcebook apps ads, display

http://bannerconnect.net – media buys/banners, good european reach

http://bidplacesb.com/ – self serve banners, owned by AOL

http://bidvertiser.com – contextual and banner ads

http://brightroll.com – media buys, banners/video

http://burstmedia.com – banners/display/media buys

http://buysellads.com – self serve banners on a range of design blogs

http://canoeklix.com/accueil – text ads on the canoe.ca network

http://casalemedia.com – self serve banners

http://cbsinteractive.com/advertise – media buys on very high traffic CBS site inventory

http://chitika.com – search related contextual display ads

http://clicksor.com – banners

http://collective.com – media buys, banners/display

http://cpmstar.com – banners display aimed at gaming sites only

http://cpxinteractive.com – banners/display, media buys

http://cubics.com – social media ads

http://directaclick.com – Owned by Fox, media buys, US Hispanic traffic

http://directcpv.com – cpv, self serve popups

http://elephant-traffic.com – ppv type ads on parked url’s – cheap

http://etology.com/ – banners/text ads, cheap

http://exoclick.com – Text/display on various inventory. Similar model to adbrite

http://facebook.com/ads – self serve ads on failbook

http://filiado.com – Media buys for Brazilian inventory

http://finditquick.com – text ads

http://glammedia.com – media buys, display, good inventory for female demo

http://globalinteractive.com – Smaller scale banner/pop media buys

http://google.com/adwords – you already know about this…

http://harrenmedianetwork.com – Media buys, South American/Hispanic traffic

http://hi-media.com – display/media buys, mainly European traffic

http://holanetworks.net – media buys targeting hispanic demo only in USA

http://industrybrains.com – now called adHere – text ads on mainly tech related sites

http://inlinks.com – inline contextual ads, like Kontera

http://interclick.com – banners, high volume media buys

http://interclick.com – media buys, display, high volume

http://intergi.com – banners and static/video in-game adverts

http://intermarkets.net – display/banners – media buys

http://isocket.com/ – closed beta, but will be banner/display ads

http://izea.com – self serve sponsored tweets/blog posts

http://kontera.com – inline contextual text ads

http://leadback.com – retargeted ads at search traffic

http://leadimpact.com – formerly zango – pops/CPV ads

http://linkworth.com – self serve contextual/inline text ads and good SEO services

http://looksmart.com – self serve search/contextual text ads

http://marketplace.sitepoint.com/cat…ertising-space – small direct banner/text ad buys

http://mediatraffic.com – ppv ads

http://mediawhiz.com – banners/display, media buys

http://megaclick.com – banners on 2 high traffic file share sites

http://mirago.com/media – UK/French/German contextual/search ads

http://miva.com – cheap search ads

http://mobclix.com – mobile ad exchange

http://mochimedia.com – self serve in-game ads, 300×250 only

http://neoedge.com – static/video in game adverts

http://offerpalmedia.com – socialmedia app ads

http://openx.org/market – banner exchange on open x ad network

http://pamojamedia.com – Adify powered, banners for African traffic

http://platform-a.com aol banner ad/media buy network

http://plentyoffish.com – coming soon self serve ads

http://premiumaccess.com – premium banner ad networ

http://pubmatic.com – ad network

http://pulse360.com – ads on good high traffic inventory

http://realtechnetwork.com – Variety of formats, self serve platform

http://reseauselect.com – banner and offline targetted at quebec

http://revtwt.com – advertising on twitter

http://rightmedia.com/ – self serve banner exchange

http://rockyouads.com – social media display ads

http://rubiconproject.com – media buys, nice interface/inventory

http://searchfeed.com – search/contextual on parked pages. shit.

http://shenetwork.se – Adify powered, target Swedish women

http://smowtion.com – display banners, most South American inventory

http://snap.com/advertisers – text/inline type ads

http://specificmedia.co.uk – Media buys/display on UK/Euro premium inventory

http://specificmedia.com – banners/video display, media buys

http://sponsoredtweets.com – sponsored twitter posts

http://statusplug.com – ads on facebook fan pages

http://tattomedia.com/advertisers/ – banners/display/media buys

http://hahahahahahahahahahamedia.com – banners

http://trafficjunky.net – self serve display/banners, good volume inventory

http://trafficmarketplace.com – display/email ads, media buys

http://trafficsynergy.co.za/adrands – banners, South African traffic

http://traffictaxi.net – self serve banners/display/popunders – global

http://trafficvance.com – good ppv ad network

http://traffiq.com – self serve banners, media buy type thing

http://tremormedia.com – media buys, good range of new formats

http://trianads.com – failbook app ads, display

http://tribalfusion.com – media buy banner network

http://unanimis.co.uk – display/video media buys, UK traffic

http://undertone.com – premium banners/display/media buys

http://userplane.com – social media advertising for media buyers

http://utarget.co.uk/v6 – UK display/rich media/video, owned by Fox

http://valueclickmedia.com – banners, display/media buys

http://vibrantmedia.com – inline contextual/rich ads, media buys

http://web.blogads.com – banners/text ads on high traffic blog network

http://widgetbucks.com – self serve text/widget ads

http://xtendmedia.com – banner/display media buys

http://yume.com – in-video ads, media buys

http://z5x.net – display banners, media buys, large inventory

http://zedo.com – display/media buys

http://zohark.com – facebook app ads

https://adcenter.microsoft.com – search and content text/contextual ads

https://marketingsolutions.yahoo.com – search/content contextual ads