"HTTP Ads is a new way for website operators to make money selling ads. It turns ad buys into impulse items by giving webmasters the power to accept credit card payment for ad space, automating the whole process. No merchant account necessary, and it just takes a few minutes to setup."
Httpads manages banners, not text ads. Meanwhile, the later get cheaper on Blogger.com, and now you can buy three different copy versions within the same pyrAds campaign.
02/24/04 update: the service has been renamed MarketBanker and switched to text ad management a while ago, while pyrAds never really took off the ground (and it didn’t make sense after the acquisition by Google anyway)/