As of yesterday, November 7th, if you aren't running Windows 7 on all of your home or office computers, then you are not my friend. That's because I believe it's an absolute no-brainer to upgrade any (and I mean
any) operating system you have on your computers to Windows 7 as soon as possible. It just works. And it's a whole lot better than its predecessor (Vista) or its aging ancestor (Windows XP) so there should be no question at all about installing it on your PC.
