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Burst Media www.burstmedia.com

Burst Media

Google AdSense - adsense.google.com

Google AdSense
#1 Ad network. In a class of its own.

TradeDoubler - www.tradedoubler.com

TradeDoubler
Affiliate network.

SitesAds - www.sitesads.com

SitesAds
Aggregator of affiliate ads. AdSense lookalike.

Clicksor Advertiser - www.clicksor.com

Clicksor Advertiser

Runbox - www.runbox.com

Runbox
Private program email and webhosting.

BidClix - www.bidclix.com

BidClix
Appear to be having technical issues with their signup system.

Yahoo Publisher Network - publisher.yahoo.com

Yahoo Publisher Network

TextLinkAds - www.textlinkads.com

TextLinkAds

MSN AdCenter - www.msnadcenter.com

MSN AdCenter
Still very early and way behind, but will eventually become a major player for sure.