The process will start if a XBLA game has a metacrtic score less than 65 and hasn't been selling well. The XBLA community is then given a 3 month notice before it gets pulled.
Mark Whitten, Xbox Live general manager, said this will help "focus the catalogue more on larger, more immersive games".
There's nothing quite like a 'spring clean' every once in a while and with the official limit of the XBLA games being raised to 350 MB in the near future perhaps breaking out the duster won't be a bad thing at all.
Also mentioned in an exclusive interview between Next-Gen.biz and Mark Whitten was that "while most users will not notice any significant changes to the dashboard this spring", the Xbox Live team is going to launch however a "new digital rights management (DRM) tool next month that will allow you to better consolidate your licenses for downloaded content to a single Xbox and allow you the freedom to be able to play your content both online and offline."
Clickto read the full interview between Next-Gen.biz and Mark Whitten.