I've now been playing with the P800 for a few days, and have discovered some other things about the phone, both good and bad.
On the positive side of things:
Mobipocket Reader is a fantastic application for reading ebooks.
VICS Video Player is a promising-looking program, although it's still in beta. This program apparently can play video at full-screen resolution at 25fps! It seems to occasionally crash (although it may just be that I am low on memory) but when it works is a real eye-opener. The one drawback is a proprietary video format which you can't encode on a Mac.
On the negative side of things:
I've discovered what seems to be a major (from the point of view of an OS X user) problem in the last few days. It appears that if you don't have some way of sending an email from your phone (such as GPRS), there is no way of transferring a file from the phone to a Mac. From my readings it appears that the most common way to do this is to browse the phone (from a PC) via the SyncStation and just copy the desired file off the phone. As noted earlier this doesn't work on a Mac. But when I try and send a file via bluetooth from the phone (which should work!) I almost always get an error - actually, I've only succeeded once!