> Can anyone with experience of such a machine suggest which models would
> be worth researching further please?
N900 running Maemo has a nice slide out keyboard. It's more a pocket
computer that makes phone calls than a smart phone.
I had it acting as a WiFi to 3G router for some linux boxen when I needed
it. WiFi in adhoc mode and CLI fiddling to setup, but then it was only for
a quick test.
Bluetooth tethering for Ubuntu seems to be well understood from a quick
web search[1] but I've not actually tried it. Why use one linux box just
to tether another linux box ?
[1] http://myn900.wordpress.com/2010/02/04/tethered-n900-to-ubuntu-9-10-via-bluetooth/
--
Bob Dunlop