samuri, got your knickers in a bit of a twist there. Vista was released in 2006. Although buggy and criticised at the time it is now very stable and as Mof said is much more feature rich than XP. XP was launched in 2001 so is now waaay out of date. Windows 7 will be released in October, so expect new machines available in time for Christmas.
Vista is fine as long as you have 2gb memory, or at least 4mb if you are going to do a lot of multi media manipulation (sounds like you’re not). Memory is cheap now so this is not a big deal.
You will be absolutely fine running Vista for the next 5+ years, or migrate to 7 when you want. It will cost, but not that much, and expect it to be pretty smooth and intuitive