Vista has been improved greatly since its release.  I have been using
it on one of my systems since March '07.   It requires more resources,
it is has problems with some older software, some of the features
suck, like backup, and the fact that the UAC does not have an "always
allow this action" setting.  However, live search is great.  The built
in troubleshooting tools are awesome (I could write volumes on this).
Its ability to discover unknown devices and find the drivers online is
very helpful.  Media Center works very well.  Ready Boost rocks.  I
understand the growing pains.  I wanted to go back to XP several
times, but this has been the case of most OS releases.  I am already
planning to upgrade several of my other systems to Vista over the next
6 months.  I was at a conference last month where the Microsoft Rep
asked a room full of 300 to 400 resellers to name what non-legacy
software had issues with Vista.  No one raised their hand.  I know
there is an issue with Visual Studio 2005, but 2008 is to be released
next month.

I'm not saying there are no issues.  I still have a few myself, but
Vista is a major impovement over XP.  That is why only one of my
systems has been running it until I am ready to deploy it to my other
systems.  I am comfortable converting my photo/video editing
workstations now.  These two workstations are my money makers.  I
place their importance above my servers.

Like I said earlier, I care about the numbers.  New systems are sold
with Vista.  Vista is on the shelves.  Vista has many new features to
offer.  I still see some Tablets offered with XP Tablet edition.  I
don't expect those to be around much longer.  It takes time to
migrate.  There are system still running Windows 2000.  Heck, I even
have a Windows 2000 Server still online serving files.  Not everyone
bought XP right away, or 2000 or 98 or 95, etc.