Adrian,
Looking around on google, I found the developer FAQ for Wacom tablets:
http://www.wacomeng.com/devsupport/ibmpc/wacomwindevfaq.html
Apparently, there is an API for the tablets which is standard called
Wintab, for which they offer an SDK. You will probably have to base
whatever you are doing off this. If they export a DLL with functions you
can call, then you can use that through the P/Invoke layer.
There is a sourceforge project which provides an COM Automation wrapper
for the API:
http://sourceforge.net/projects/vbtablet/
Which you could probably use through COM interop.

Signature
- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard.caspershouse.com
> Hi,
>
[quoted text clipped - 7 lines]
>
> Thanks