Over the past couple months I've started using OneNote 2007 for meeting notes and general to-do lists. If you haven't used OneNote before, definitely give it a try. It's one of the nicest tools (yes, I consider it a tool, just like my paper notebooks) I've used for managing unorganized piles of notes, and it's driving me towards picking up a tablet pc. More on that later as the evaluation units pour in over the next couple months.
Two sites that have made it into my RSS subscriptions are GottaBeMobile and Daniel Escapa's OneNote Blog, and recently a GottaBeMobile forum member posted a video comparing Vista's handwriting recognition to OS X's Inkwell.
Sadly there isn't much of a comparison. Vista's handwriting recognition has come a long way since XP, and it's pretty obvious InkWell isn't a priority for Apple, at least not yet.
Take a look at Vista's Ink on a Toshiba R25 Tablet and Leopard's Inkwell on a Mac Pro with a Wacom PenPartner tablet:
View on YouTube