Want a treo phone that works in Japan

Does anyone know if it's possible to use one of those nifty US PalmOS smartphones in Japan? I know they wouldn't be officially not supported by any Japanese carrier, but if I'm reading it correctly I believe Cingular supports a roaming partnership with both Docomo and Vodaphone. So is it possible to buy a TREO 650 GSM model, swap the SIM card and use a local Japanese contract?

It'd be great to stop carrying so many gadgets.. These days the ipod mini looks pretty cool, but I don't think I could put up with lugging another thing around.

progress...

I couldn't be more pleased with my progress studying Japanese with Supermemo.

As of today, I can write 1605 kanji on demand, with an error rate of about 10%. I've added many times that number of words to my vocabulary.

I can't believe I didn't have this when I was in school. My company generously provides me with an hour-long class per week, and finally I'm actually learning what the guy teaches me at the time.

Too bad the silly guy who wrote the palm-version of supermemo won't take the time to upgrade it to use hi-res.

... update ... The hi-res palm supermemo is out.