Castle Crashers the second game from the Behemoth who also brought us Alien Hominid is coming out on the PSN at the end of the month. This about 2 years after the game came out on the XBLA. Castle Crashers is a side scrolling beat'em up in the same vein as Streets of Rage or the TMNT arcade games.
You pick one of four knight Red, Orange, Green and Blue each with their own special magic attacks. As you fight you gain experience and level up which allows you to use more weapons and more powerful magic.
I played the hell out of the game when it came to XBLA and anyone who hasn't played it should definitely pick up the PSN version when it comes out on the 31st.