Here's just a bunch of random sites I've found over the last few months.
There's vidoes.antville.org which is a play for people to post links to *cool* music videos.
There's enthu.cool.ne.jp which is a bbs with links to funny or interesting pictures, animations and flash stuff. Some of it's pretty funny. Warning: adult content.
There's Oopsy-Daisy which is cute. Talk about major merchandising though. Related are the Breakfast Club, Bon Bon and Emily