Poor old Edge. It used to be covered in Matt Mathews' lovely NPD analysis graphs every month, but it appears no longer: here's the latest feature, and it's on Gamasutra. It's exclusive, says the site. Some people are just mercenary.
By the by. There's graphs there about Guitar Hero sales, estimated year-to-date software sales, weekly handheld sales rates and loads more. Take a look.
Update: Gama editor Simon tells us that Matt did his first feature for Gamasutra before being recruited by Edge. So Matt's going home, in a sense. Swings and roundabouts.