I dunno about you guys, but I personally love when I find a hidden gem on the internet. Here's a place where you can share them! Make sure to offer a brief description in your post, so anyone clicking the link has an idea of what they're getting into.
Please don't post links to inappropriate websites, such as those that contain porn, excessive violence, hateful messages, etc... Thanks!
I'll start us off with a few of my favorites.
The first is related to roleplaying and character-building. A Mary Sue test! It's pretty lengthy, but I personally think it's hilarious and fun to wring a character or two through.
http://www.springhole.net/writing/marysue.htm
The second isn't related to roleplaying at all, really, except as a place to find a little inspiration. This website offers all of the sounds of a thunderstorm without the actual rain. There is also an option to turn on the day's perfect "rainy day" music, but I've often found that I can come up with something more suited to my tastes. Still great, though.
http://www.rainymood.com/
YuriRhythmics
A yuri roleplay guild, because there just aren't any yuri roleplays anymore!