San Francisco-based Pyra Labs was formed in 1999 to build powerful web tools for regular people. Pyra's main product, Blogger, has been widely acknowledged as the leader of the rapidly growing weblog phenomenon, which has transformed how people—from the digerati to high school students—communicate, gather news, and share information. Blogger has organically grown to over 560,000 registered users worldwide.
And they are offering text micro ads on Blogger for as little as $10. Not bad for a large target market of creative types.