Today, Indie-ana Co-Op goes on an adventure in the wide world of iPhone/iPad gaming. The common theme for this installment? Zombies. Two different takes on the theme are investigated: Tweet Defense and Alive 4-Ever Returns.

This weeks On The Download will feature plenty of brand new downloadable co-op news, including some hot topics like Halo Reach's Beta, loads of new releases and even a rumor. We're also going to revisit the world of Aces of the Galaxy - one of my favorite recent co-op purchases on the XBLA.

Did you know Co-Optimus now lists iPhone/iPad/iPod games in its database now?  It does.  Despite covering the platform for some time we just didn't feel it was worthwhile to break out the few co-op games it has, but now with several high profile releases, we've decided to track these titles more closely.