http://www.webmasterworld.com/microsoft ... 231524.htm
There are still massive amounts of people out there using XP, so many that Microsoft extended the support for it for an extra 5 years. It is still a very good(for a Microsoft) OS. I did use windows 7 for a time before moving to Mac and found it to be considerable amount better than Vista, but i still cant work out why it updates all that time, It seams like every day i turn the laptop on at work and it configures more updates. Then the Anti virus needs up dating and the firewall setting are incorrect then there are those times where it just stops, and the questions. "are you sure?" "are you really sure?" "do you really want to do that?" "this might have been downloaded from the internet. are you sure you want to open it?" "updates are available for this computer" "windows need to restart in order to finish installing updates" and my fav one "windows update needs to update in order to install updates"
It did take me a little while to get use to using a Mac but I aint ever going back. once a mouth (at most) my mac pops up a little window that says" there are some updates available for your computer. Would you like to install them now?"
The only downside to the mac is that everything is still geared toward windows, although the software list available for Mac is getting much bigger there is still the odd one that you cant have, but in most cases there is a equivalent that is just as good or better.
Sorry rant over. yeah buy a Mac, I would still recommend a Intel over G4 or G5, mostly because Snow Leopard is just Awesome and the Intel's support more software, Including Windows for when your PC completely gives up.