N800 is not a very good choice for a Personal Digital Assistant. Poor contact and scheduling support and no synchronization. It displays pdf files well, plays music OK, plays video clips OK, displays pictures very well and surfs the net well. Honestly the best use I've found is as a mini porn machine as you can not get hijacked by spyware. I guess it would be good at GPS as well, but I haven't got a GPS antenna yet so I can't comment on that. I love my N800 for what it can do and hate it for what it can't do. Unfortunately it "can't do" more than "it can do".