I found this phone which works with Docomo in Japan:
It's a Motorola PDA phone that I'm guessing never caught on here in Japan. It wasn't available at the Docomo shops I went to in my city. Anyway, I'm mentioning it because I just got one for 17,000 yen. Phones like this usually sell for about $400 to $600 in the States.
Like I said, I'm guessing the PDA thing just never caught on here and now sellers are just dumping their stock. It's quad band so it will work in the US and Europe. Full PDA, MS Word, Outlook, Excel, etc. WiFi internet, Bluetooth, email, all the bells and whistles.
I'm going to try to add Skype to it. I have wireless in my house so it should always be connected. With Skype I can get a US phone number, meaning when someone calls my US number in the States it will connect to this phone in Japan, so for them it's just a local call.
Hopefully it all works out. Just thought I'd let you guys know in case you wanted to grab one for yourself. I've always wanted a PDA phone to be able to get emails on the fly.