Actually, this is the Web 2.0 that Arrington (as in TechCrunch) can't live without, and it's worth a look whether you are a Web 2.0 Geek or not.
He's noted his Web 2.0's faves since 2006, and it's interesting to see what's survived and what has gone by the wayside.
Survivor: Amie Street, Netvibes, Skype, Digg
My faves on the list: TechMeme , Facebook, and Google Reader.
Arrington's complete web 2.0 list HERE.