There are several of these around the web, the best however is VNes found at: http://vnes.thatsanderskid.com/ it has an incredible number of games (the most online I believe) and is all made by a guy that is 16 IIRC.
I would have to say the best thing about this site is the content. It doesn't sit on certain specific topics (gadgets, pictures, news) and it doesn't try to force anything down my throat. Some sites try to get you involved in what they are doing and that is all fine and well, but if I just want to check out some things without being pressured about anything I come here.
And that is a daily occurrence and is the reason why I visit this site everyday.