I've had the N900 for three days:

* GPS works fine for me. In fact, without me knowing it, it's been always on. It was only when I looked at my geo-tagged photos that I realised that it was tagging my *exact* location.

* Re MP3s, poster was right re interface. It can be most generously described as functional but boring. That said, I haven't noticed any battery life hit from playing MP3s.

* Web browsing: this device will change your life. Really. On the iPhone, I would use the web when I had a specific thing - a cricket score, or whatever - to look up. With the N900 I surf for fun. That, to me, is revolutionary.

* Videos: so far it's played randomly downloaded xvids and .movs without problems. Screen quality is excellent.

* Contacts app. Pretty poor. But I do all my organising in Google, so not too big a deal.

* Phone. Best bit is Skype integration. Very cool to be able to route calls over Skype when that is the cheap option. I have terrible cell reception at home, and the ability to pick up my phone and make calls from my phonebook over Wifi over Skype is pretty awesome.

All-in-all, still a little unpolished, but highly recommended.