http://z.us.changyou.com

I've only played it a little but looks pretty interesting so far.
Has a lot of classes.
Kind of a cartoonish looking and humorous but not anime style.



To get a closed beta key go here: http://z.us.changyou.com/news.php?id=news5
Click on ">> closed beta".
Open all the sites first. Some you don't need to register on first.

Update:
Open beta now as of August 18th. 2010.
Doesn't require a key.