Hi,
i'm currently looking at a N810 as a small replacement for an Laptop on Weekend trips. The alternative would be an eee PC.
The things i'm most interessted in would be video Playback on long train rides and personal information management during the Weekend.

I'm mostly concerned about two things:
Playback time for video:
I have heard very different times for video playback, ranging from 2.5 hours to 6-7 hours. I would like to have at least 4 hours of video playback at the least screen brightness etc. - Is this possible with external battery packs, or other accessoires?

PIM:
I'm currently struggling to keep my cellphone (K810), laptop and desktop synchronized. This is further complicated by the fact that i'm using both Windows and Linux. On my PCs i use Thunderbird / Sunbird with IMAP to keep my E-Mails synchronized and update my Calenders and Contacts manually.
I don't want to use google Calender, because i try to be independent of third party servers.
I heard of pimlico and it seems to integrate nicely with evolution. Would it also work well with Sunbird?
And if it does sync, does it sync both ways (PC -> N810, N810 -> PC)?

I hope this question hasn't been asked too often.
Bye,
NsN