Windows 7 rocks as they say.  Been running it for a long while now and makes Vista seem as bad a shell as XP these days.
The Beta, then RC and now the RTM code is very, very solid.  Amazingly fast and a dream to use.   Owning a Mac as well, there are some compelling reasons why I still think its the premier desktop OS.
One annoyance though is being able to ‘pin’ applications to the tray.  Depite all your efforts, some will not do it.  Instead follow this procedure how to do it.  Its a frig, but one that works !