The pen of a tablet PC can provide a lot of details to your tablet applications. Playing around with several pens and tablets I found out that there is a difference between the pen's properties reported as supported and the pen's properties which really provide a variation in input. For instance: my Acer tablet reports to support the tilt of the pen (imagine a pen as a joystick) but the reported tilt is always zero.
I have built a tiny test application which will report which pen properties are supported by your tablet and will also monitor the actual values coming in. It is based on the samples coming with the “Building tablet PC applications” book. In an upcoming article I'll discuss how the app works. I'm also working on a web-based version, have to take some .net security settings hurdles to make that work on the global web.
You can download the app here. It requires XP Tablet PC edition 2005. I am very curious what your tablet will report. I do hope for a difference as this would be a nice way to really compare tablets. When it comes to screen size, memory and the like there are only about 3 models on the market. The capabilities of the digitizers, as reported by the API, could make quite another difference.
Peter