Favorite Joke channel: 一天一囧 on tudou.com This is a great joke channel for Chinese jokes on <a href="http://tudou.com">tudou.com</a> (tudou is like a youtube.com for China). 
<a href="http://so.tudou.com/isearch/%E4%B8%80%E5%A4%A9%E4%B8%80%E5%9B%A7/">一天一囧</a>

If you don' t know what 囧 Jiong means, you can check it <a href="http://www.italki.com/answers/question/38131.htm">here on italki answers</a>.

There's also a great site called <a href="http://www.chinasmack.com">chinasmack </a>with an awesome <a href="http://www.chinasmack.com/glossary/">glossary</a>

Anyway, it's a sort of silly site, but it's sometimes pretty funny.  (Your Chinese has to be pretty good to get it...)