IM not exactly sure what you mean by that but IMO, "the more the merrier". concepts apply here just my two cents. Anysite that I can learn from and interact with it's good stuff.
Hmm...every day -
Facebook
CF
Google
Hey, It's Free!
Pandora Internet Radio
Also, not every day, but a lot -
Gamespot
aim.com
YouTube / Google Video
mininova
isoHunt
Pirate Bay
dictionary.com
thesaurus.com
urbandictionary.com
wikipedia
newegg