update: However, for the purpose of testing out some basic ink functionality when developing ink-enabled apps, without having to go out and purchase a tablet pc, this might do the trick. I don't think (from my one minute of testing - let's be clear about that) that this will be good if you are testing intensive functions that depend on granularity such as breaking a stroke down or working with stylus input.

http://www.AcehAid.org