For you Penny Arcade fans, the first episode of their game is out. I bought it and installed, and I love it. To me, it brings back all the nostalgia of Earthbound, one of my favorite games of all time. The goofy weapons and abilities coupled with the dry and ridiculous wit that we've come to know and love through the strip make for a great experience.
I've only played briefly, but the combat system looks like it has the potential to be fun also. It's definitely not super-deep with all kinds of crazy counters and combos, but it's not just button mashing either. Most special abilities are interactive, meaning you have to press buttons during use to maximize their potential rather than just clicking them and watching them crush all the yard trash random battles.
If you're a fan of the strip, I think this is definitely something you'd enjoy just based solely on the fact that it's an entire story built around Gabe and Tycho. If you're not, I still think it's worth a look, and you can download and play the demo for free. The site also has a four-part backstory (in comic form) that sets up the game and the world in which it takes place.
Official Site