I have owned a Palm One Lifedrive PDA for three years, now, and I must admit, I find it absolutely indespensible.
This edition, which ships with additional software, has a number of useful programs and capabilities inbuilt. Firstly, it has a 4gb Hard drive, which is pretty useful for storing films to watch on the move. I've installed The Core Media Player, but the inbuilt one should be quite sufficient for most people's needs.
Secondly, it comes with documents to go as standard, which allows you to open and edit Microsoft Office documents on the machine. This facility has changed my life, as I use it with a little flod out keyboard (not included) and this allows my to work almost anywhere.
The PDA also has inbuilt WIFI and Bluetooth capability, allowing you to surf the web on the go - although the shipped browser, Blazer, is rather clunky - I've replaced it with a mobile Opera browser.
My other main use is reading ebooks - for this the machine is perfect - a nice sized screen, and with the free mobipocket software installed, most electronic documents can be converted into an easily-readable ebook.
In terms of battery life, the machine is not too bad - you can dim the screen for extra time, which helps greatly, The battery is a rechargeable inbuilt model, and seems pretty efficient - at least I've never had any problems with it.
Overall, a good product, and one that can be picked up quite cheaply now it's getting a bit older.