http://adbuyer.com – media buying search/display exchange

http://adchap.com – ads on various social sites, hi5, facebook, bebo et

http://adclickmedia.com – self serve banners and contextual widgets

http://adconion.com – display/media buys, good for Europe

http://adconion.com – video/banner ads, media buys

http://adengage.com – banners/text, similar to adbrite, allow weekly buys

http://aditall.com – produce and run video ad campaigns

http://adjuggler.com – display/media buys

http://adknowledge.com – cheap ads, slow approvals

http://admedia.com – self serve inline contextual text ads like kontera, also display ads

http://admob.com – mobile ads, now owned by google

http://adonnetwork.com – banners, contextual, search – self serve

http://adoori.com – ppv, popups – self serve

http://adoptim.com – in-video, text and banner ads

http://adpepper.com – European banner display Affiliate network with mostly European big brand offers