Categoriz volunteers a sitemap of web 2.o services by listing categorized links to the slew web 2.o offerings. According to the John Diep, Editor of Categoriz:
"It started as a simple list of new products and services that we were watching after reading news and feature magazines on Web 2.0 technology such as TechCrunch and Mashable."
I like the simplicity of the site. Assuming the site will continue to be up to date, I think it will be a handy resource for keeping track of links to all the various web 2.o companies. However, if you prefer a more info on any one of the web 2.o companies listed you might want to check out the Company Index on TechCrunch.