Did you have any luck with this? I'm thinking of buying an Archos 70, but I want to use it almost entirely with handwriting, and after Windows 7 and ritePen for Windows, I have high standards.
This looks interesting and helpful - seems DioPen, MobileWrite and PenReader are all options.
Please let me know what you find out!
I had the Newton 2100 too. My best recent experience with hwr tablets has been - wait for it - Windows. First with XP Tablet OS, then XP with ritePen, then Windows 7. Microsoft may have got many thins wrong with tablets but hwr wasnt one of them. Still convinced this is primarily a screen/stylus problem on the Archos, though.
Honestly, if you want a handwriting-friendly tablet, get yourself a 10+ year old Newton Messagepad 2100. It's the only one ever to have been geared towards HWR, and - moronic Doonesbury cartoons notwithstanding - it is fabulous, both the HWR engines (it has two of them!) and the user interface experience. It shows you what Apple could have been without Darth Jobs.
Unfortunately, you'll have to forego decent storage, usable internet access and a colour screen. Still, for me it was almost worth it.