Hey,
If you are talking about the PC version, then this page might interest you.
http://thesims2.jouwpagina.nl/
It has links to lots of Sims 2 websites split into catagories.
Or alternativily, go to Google and type in 'Sims 2 objects' if you are looking for furniture and 'sims 2 skins' if you are looking for clothing, as these are the names commonly used for the things you are looking for in the Sims community. Usually once you are on one of these sites, they have a 'links' page that can give you the web addresses of many other sites! :)