Paul Mooney thinks that collaboration is the killer app on a Tablet PC.
A SharePoint Portal configured with Tablet friendly Web-parts and a wireless Wi-fi connection is the alignment that constitutes the sweet-spot for Tablet PC adoption.
I think Paul is on to something with this train of thought, something that has been bouncing around the web lately with all the talk about shared sessions in OneNote, using MaxiVista to host collaborative presentations with either Powerpoint or MindManager and Skype or MSN Instant Messenger to have conference calls and chats.. The collaboration tools are out there and the Tablet PC with inking makes them so effective to leverage them to maximum benefit. How are you using collaboration tools with your Tablet PC?