DevArt. They got pretty pictures. Also, it got a good help central (well, a lot of tutorials), and I have heard the forums should be nice too, though I rarely travel there. They have contests where you can win all you might need, such as tablets and money. Oh, and of course, there is the drama..
And as always: Give a reason why your favorite is what it is. It is simply not enough to just write out the name of the site, and then a "it's awesome". Give a good reason, and maybe even one good enough to make people visit the site.
I like My Minilife. There's where u can build your mini homes, sell items and get profit from item u sold, also join the best home contest and win the prize.
Smash World Forums. It is a great site for fans of SSB, and has a competitive community. They also have drawing contests, character discussion, WiFi friend finder, basically everything a smasher could want (except for a Link forum).
But, can you guys do me a favour and not go there? Most people here know nothing about Smash.
This is a very wide topic because there are very different kinds of websites. So I'll just say all of them!
http://pandora.com/ - music http://youtube.com/ - music and video http://runescape.com/ - game and chat http://kongregate.com/ - games and chat http://www.cartoonnetwork.com/video/index.html - believe it or not, they actually have some good shows there.
