I have owned a TablePC before so I've used a few things regular users probably haven't seen.

The Tablet Input Panel or TIP. Vista comes with the TIP, just go to Start > Accessories > Tablet PC Input Panel.
This will give you a handwriting recognition panel plus an onscreen keyboard.

On a tablet (and a pocket pc) you right click by clicking and holding for 2 seconds. I could not get Vista to treat my mouse as a pen to enable this but maybe some wii remote drivers could be made to emulate a pen?
What I did find was some software written by Jerry Kindall to emulate the click and hold right click functionality.
http://www.jerrykindall.com/download/softrightclick_beta.zip should work under Vista and XP.

Tried it out under Vista and it works great.

If your using Vista on a desktop the Tablet PC parts are not installed by default. They are on a laptop though.
To install the TIP go to Control Panel > Programs and Features > Turn Windows Features On > Check Tablet PC and it will install the parts. Once you have the tablet parts installed you can find the TIP under the Start Menu > All Programs > Accessories > Tablet PC > Tablet PC Input Panel.