For hybrid tablet users, Windows is the only way to go, and in that respect, I think the MS team did a pretty damn good job with the bundled functions in Vista.
And those who haven't used tablets before don't know what you're missing out on :-)
I just finished Jaunty; the out-of-the-box support was remarkable, but it still falls short of Vista.
Vista is really a "tablet-aware" OS; when you pick up the pen, all the penabled functions come alive. When you hold down the secondary button, an indicator appears. And you have the screen rotation buttons, on screen keyboard, excellent handwriting recognition, and the journal app, which, despite it's lame (non-svg) format, does a decent job.
Jaunty was awesome up until the point of dual head. My video card is partly to blame, because on xorg I can't set two screens of different resolution, so my second monitor looks terrible, not to mention the logout required. In terms of tablet functions, you have to readjust the coordinates after you add the second monitor. On Vista, everything works with close to no intervention, and plugging in another monitor, everything still works as you expect.
That's not to say Jaunty wasn't hella impressive; it was. But I'm talking about built-in features, and in this respect Vista is still ahead. Anyhow, back to ubuntu on the VM.
And those who haven't used tablets before don't know what you're missing out on :-)