[Brian]

Installing your license on more than one computer is perfectly fine.

Using MobileMe as your sync server, there's no reason not to have all three devices (two macs and the phone) all sync. If your phone isn't able to get a connection to the MobileMe servers, it'll be unable to sync for a while, but we designed the code to handle situations like that just fine.

The phone will just be a bit out of date until the next sync, but it'll catch up just fine once the network connection becomes available again.

It's generally a best practice to work on one device at a time, and sync both when switching from one to another. The system doesn't require that though. It just makes things go a bit faster and predictably.