Gamasutra: The NPD Group revealed the top retail sales of May 2009 some two weeks ago, and every month, Gamasutra sister site GamerBytes looks at what NPD numbers don't cover: The games released via the Xbox Live Arcade and the PlayStation Network.
We're analyzing the weekly Top 10 Xbox Live Arcade game purchase list released by Microsoft through the Major Nelson weblog, checking out Leaderboard data for games when available, and seeing which new releases have done well and which have fallen off the map.
Please note that we do not have the Top 10 list for the week of May 25th. Due to the Electronic Entertainment Expo and Larry Hryb's trip to see the troops in Iraq, the numbers were never posted. But thankfully, we do have Leaderboard data for those titles.