Ultimate Blog Marketing

Contextual advertising are text ads delivered based on the content of the web page using an automated system. Aside from Adsense, here are some other places:
Yahoo! Publishing Network (currently in beta and available to US publishers only) http://publisher.yahoo.com/
Intellixt http://vibrantmedia.com/site/web_01a5.ht…
Quigo Adsonar http://www.quigo.com/adsonarexchange.htm
IndustryBrains http://www.industrybrains.com
Commission Junction Evolution http://www.cj.com
Kanoodle Brightads http://www.kanoodle.com/about/brightads.…
Clicksor http://www.clicksor.com/affiliate_progra…
Contextweb http://www.contextweb.com/
Bidclix http://www.bidclix.com/
Bidvertiser http://www.bidvertiser.com/
Also consider joining an advertising network. Advertising networks are organizations that aggregate Web sites that offer advertising space, and sell banner ads (and other advertising options) across them. Traffic requirement is often a minimum of 5,000 monthly impressions, although many do not accept sites hosted by free page services.
Burst Media http://www.burstmedia.com
Fastclick (ValueClick). http://www.fastclick.com
Advertising.com. http://www.advertising.com
Tribal Fusion http://www.tribalfusion.com