Ah, how I enjoy reviving old, even antique hardware and make them work in the modern age. Recently I scored a cheap tablet computer on eBay, a Fujitsu Stylistic ST5011D. It's got an Intel Pentium M 1Ghz processor and a 10 inch display. (I think these pen-based tablets are far superior than modern "gadget" tablets like those from a certain fruit company, but that's another story.)
I slapped in a stick of 1GB DDR SDRAM (making 1.5GB total), a 160GB IDE (!) hard drive, and a MiniPCI Wireless card, and set to work on installing Windows 7 on it. Although the hardware is more than sufficient to run Windows 7 smoothly, there is no official support or drivers for this "obsolete" hardware. Therefore it takes quite a bit of trial and error to get everything working. For my fellow tinkerers, I have a few pointers here that hopefully will save you some time in similar pursuits.
After all is done, the tablet runs beautifully with Windows 7. Handwriting recognition is a joy to use. Coupled with Onenote, this is the ultimate notebook (as in a book you take notes in) one can ever get.