Windows XP
I have recently upgraded to XP and found the functionality worth the investment. There are heaps of streamlined interfaces and I find the XP has been extremely stable. I also added Office XP version 2002 as well and my system has never been more stable. I did not notice too much changed in Outlook to get excited about. The Windows XP is worth it and one area that works well for me is the Net Meeting and remote functions and collaboration tools.
In regards to the pen, I was in the US recently and noted a few users of the pen, (how can you miss them?!). The feedback I had was they worked well but not perfect. Great for the lover of gizmos but not yet perfected for those like me who want a functional tool rather than a neat thing to work on or play with. I also found the size a bit off-putting but that could just be my outdated attitudes or ego!