Oh I agree absolutely with most of your points.

I like wayfinder as I now have one bit of kit which is portable. I appreciate TT etc now do Mp3 playback, but I cannot telnet or VNC into my myth box at home.

Like you I would never dream of needing to load office in my car, but I can see some who would to read attachments.

I also use carman, which is really not much more than a toy but does show some interesting data.

What I would really like to see are

a link between carman, GPS and the internet so that a database of fuel stations and prices in say a 15 mile range along the route can be downloaded and displayed on the satnav with a choice of detours to either the nearest or the cheapest when the fuel reached a certain level - say a 1/4 tank.

You can already traffic radio service available over the internet from the UK highways agency. I've had a listen and for me ( with a near 40 mile commute) the area covered is too large, to similar to listening to national BBC. Be good if it was possible to download a podcast at regualr intervals. Wayfinder already has traffic info alerts, which are mixed in my area probably as the road network is not as monitored as busier areas.

Rather than full blown voice, simple voice tags for commands would be extremly useful, such as play, pause, next etc. Similar to the voice controlled dialing most phones have.

I have mobile broadband on my phone, so any internet based stuff is already possible. I have once used it to download a menu from may favorite indian takeaway so we could choose, and then phone an order to collect on the way home.

A lot of this stuff is there already, but the bits just need putting together correctly.