Self Service Web Ads
New (late-2001) trend of setting up systems where people can buy small batches of WebAd-s with no human intervention.
Kicked off by Google's AdWords. Which is the only one I know of which is targeted (by keyword), as opposed to just being rotated randomly. But more expensive; the others are cheap enough to be a hobby self-promotion.
HttpAds is run by FuckedCompany's Philip Kaplan, and any site operator can host/sell ads.
Blogger BlogSpot ads http://www.blogger.com/spons/blogspot_ad_buy.pyra
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