jornada_win
A view of the Jornada showing the Windows Professional Handheld PC 2000 interface. It's a version of WinCE that didn't actually end up going on many devices (PocketPC was more popular) but it's not too bad to work with. It comes with "pocket" versions of Word, Excel, Powerpoint, etc., and you can actually transfer files between these and their corresponding desktop cousins to some extent.
The Jornada 720 is probably my favorite Tiny Computer right now...it's extremely small and light, and has all the functionality of a "palm"-type device along with some Windows-compatible stuff. I can take notes on it using the cute cute cute tiny keyboard (which I am completely obsessed with), and the battery life is around 9 hours on one charge. Not bad at all, and vastly better than a laptop that only lasts 2 hours or so while being much heavier.
You can also apparently go online with this thing, but I've never tried that.