This month, I should be getting my pre-ordered copy of Windows 7. I've been running the Release Candidate (RC) version of Windows 7 on many of my computers and I'm looking forward to having a permanent operating system so that I don't have to reinstall all my applications, copy my files, etc.
I don't have any computers running Vista anymore. Moving forward, I'll simply run either Windows 7 or XP on all my computers. I wonder how long XP will survive. It's certainly had the longest lifespan in the history of Microsoft's operating systems. I wouldn't be surprised if many computers are still running XP in 5 years.
Over the short term, most hospitals and physician offices using electronic health record (EHR) solutions on PCs running XP will probably stick with XP. If you're starting from scratch and you're about to implement your first EHR, then I would suggest that you run Windows 7.