It was a foregone conclusion, but I put myself through it anyway.
The most annoying bug (and I'm not alone in this), is the inability to write files on network shares from the Vista Windows Explorer. Any third party app works fine. Crazy, huh? And no, it's not permissions. I turned all that shit off.
I found two bugs in Word 2007 as well. The first is the, ahem, over-zealous undo function, that wipes out entire paragraphs with one Ctrl-Z. The other is the misplaced delete: if I select a word and press the backspace key, it deletes the preceding word.
It's too late to go back to XP now, but let's hope SP1 fixes some of the performance and usability issues.
I stand by my original idea: Microsoft rebooted development on Vista, but just made a bloated version of XP. They should have started from scratch and just incorporated Virtual PC a la Apple's Classic interface for old software. If the .NET Framework is as good as they claim, apps written in C# and VB.NET would run on the new platform with little or no change.
*smirk* – no comment 😉