According to Major Nelson’s website, today both Zeno Clash Ultimate Edition and RayStorm HD are being released on Xbox Live Arcade for 1200 Microsoft Points each.

For the rest of May and early June on Xbox Live Arcade, look for Rocket Knight (1200 points) on May 12 and Snoopy Flying Ace (800 points) on June 2.

On May 11, Tom Clancy’s EndWar is becoming an Xbox Live Game on Demand and The Secret of Monkey Island: Special Edition will be the Xbox Live Deal of the Week starting May 17th. You can steal that for only 400 points.

For the rest of the items being featured this month, including items in the Avatar Marketplace and other 360 game add-ons, check out Major Nelson’s blog.