Android Market version 3 update
Android Market on my Sony Ericsson Xperia Arc recently updated to version 3.
Not a pretty sight, really. This is version 3.1.3.
Next day update: as it turns out, I had two Google accounts set up on this phone, and the new Market picked the wrong one. So if you get into a situation like this, press Menu in Market, then Accounts, and choose the account you use to make Market purchases.