Google just showed us the new updated Android Market client that brings a UI overhaul, as well as Google Books and Movies for folks in the states.  Not long after, we gave you a way to download the new Market for yourselves, and you guys got to work checking it out.  It has a lot of different features, including one that a lot of us have been wanting — the ability to switch to any Google account on your phone for Market use.  You can even choose a Google Apps account.  This could be a pretty handy feature, but also opens up the possibility of abuse via shared account credentials.  We’ll have to see how it all unfolds.

Source: Android Central forums