I have had a couple people mention my inking code not working on non tablet PC despite having a Wacom Tablet.  Turns out  on vista on a non tablet PC you need to register 3 assemblies to write .NET inking code:

gacutil –i iacore.dll

gacutil –i Microsoft.ink.analysis.dll

gacutil –i ialoader.dll

 

Located in:

cd %ProgramFiles%\Reference Assemblies\Microsoft\Tablet PC\v1.7