Here's the Groove press release: Got Ink?. Ray's quote:

The combination of WiFi networks, the Tablet PC and secure, smart applications such as Groove give users the freedom and flexibility to get their jobs done regardless of location, and organizations the ability to reduce their overall coordination costs, without sacrificing security, or control.

I'm expecting more lukewarm reviews than ga-ga. But even the NYT says

a touch screen can be a useful enhancement. You can use a Tablet PC standing up - not something people do every day, to be sure, but handy in certain lines of work.

You can't simply mark up a Word document with circles, arrows and crossout lines, as a proofreader might with a red pen