I found out about Fusion One today. I suppose it's old news for anybody that's uses MP3.com regularly but it seems pretty cool.
They have some software that runs on several devices and allows you to keep all your devices in sync no matter which device you use. Edit a document at home it gets updated on your work PC. Edit something on your work PC it gets updated on your PDA. Edit something on your PDA and it's also available from any internet connected computer. It sounds like great idea. I wonder how many sites and people they have connected.
For example, using FusionOne you can plug your PDA into anybody's cradle (as long as they've installed FusionOne's software) and sync from there.
They also supports web/email enabled phones