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Here is a short list of CPM Networks (the cost, per 1000 people reached, of buying advertising space in a given media vehicle). You can register with these advertising companies and submit your banner ads, text ads and other forms of online ads. Once you are registered they will manage the placement and rotation of your ads on their network sites. You pay some sort of fee for the number of times your online ad is displayed.

Ad Brite - www.adbrite.com

Ad Sational - www.adsational.com

Blue Lithium - www.bluelithium.com

Mamma Media Solutions - www.mammamediasolutions.com

Tribal Fusion - www.tribalfusion.com

Flat Fee Spectrum - www.flatfeespectrum.com

Burst Media - www.burstmedia.com

Double Click - www.doubleclick.net

The Ad Stop - www.theadstop.com

Hyper Bidder - www.hyperbidder.com

Prad Network - www.pradnetwork.com

Value Click Media - www.valueclickmedia.com

Ad Jungle - www.adjungle.com