Ad server list and comparison

Absolute Banner Manager $229 **** http://www.xigla.com/absolutebmnet/
DART http://www.doubleclick.com/solutions/publishers/index.aspx (***** Free and very easy to use)

Accipiter(now Atlas)
Ad Hosting Solutions (open-source Linux/Apache/PHP/MySQL)
AdBureau https://secure.adserversolutions.com/adserverorder.html (too expensive)
AdJuggler (http://www.adjuggler.com/???)
AdRevolver (Dead?)
AdSpeed http://www.adspeed.com/Plans.html (too expensive)
AdTech http://www.adtechus.com/Home/ (No Pricing, may not for Small Biz)
Advert-pro http://www.advertpro.com/pricing.html (too expensive)
Atlas ???
Burst Ad Conductor http://www.adconductor.com/index.asp (No Pricing, may not for Small Biz)
Buzz (Dead?)
CheckM8 Advantage http://www.checkm8.com/products/advantage (No Pricing, may not for Small Biz)
ColdFusion (no info?)
Falk (Dead?)
Mediaplex http://www.mediaplex.com/ (No Pricing, may not for Small Biz)
OAS (www.247realmedia.com???)
Openads (http://www.openx.org/?? no info)
phpadsnew (no info)
Proprietary Ad Server (no info)
Zedo (http://www.zedo.com/press/20060411-adotas.htm no price info)