The Sims 2

You can find good walkthroughs for The Sims 2 as well as a lot of general information about the game over at IGN.

I'm not a huge fan of IGN. In particular I don't necessarily agree with the reviews that they provide, but they do tend to collect reasonable walkthroughs and cheat information for games that have been out for a few years.

If you are looking to post original information for The Sims 2, then by all means go ahead. There really isn't a whole lot of competition out there for it. Although there are quite a few sites already with game anecdotes and screen shots etc.