Pen Based Operating Systems On The Net?

Kyudosha asks: "I have just purchased an IBM tablet thinkpad 730T. My main intention in buying this computer was to take real-time notes in my classes, and drawing embedded pictures within these notes (sort of like in Word). Unfortunately, the Pen Point os has been wiped off for resale reasons. Searching for a free pen-based O/S on the Web yielded nothing. I would very much like to see this computer in operation, and I have heard rumors of Linux-based pen o/s's or non-commercial o/s's in the same vein, but I cannot find any information. I have pleanty of PCMCIA hard drives, and a laptop capable of placing software on them, but like I've said...nothing. Can ANYONE help me?"