These sites are all personal favorites of mine and I feel will help you if you would like to know more about TS2.
My Top Three Favorites
The Sims Resource
"TSR was established 1999 and has served The Sims community ever since. Today it is the world's largest unofficial The Sims site on the Internet." (from TSR homepage)
"WorldSims has been nominated at "The Sims 2: Letting You Know Sims 2 Awards" under the Best Site category."
Go here to read all seven Sims2 Designer Diaries
Sims 2 Center
First fan site to open strictly devoted to The Sims 2
Sims 2 Talk
Go here to chat about The Sims2
The Sims Stash
Up to date info, tutorials and much more, go here for everything Sims2
Another site with every thing you need to know
5/09/04-The Sims 2 Music