I think I may just have found the perfect mobile Internet device. I managed to pick up another Asus Eee PC 4G for myself the other week and have also picked up a micro usb bluetooth adapter that is only about 6 mm long. The USB plug is longer than the adapter. The PC is running XP.
I've got this paired with my 3G Orange K850i phone and it's all working perfectly. I have a decent screen, a full keyboard and every application I need, all in a small laptop not much bigger than a paperback book. The only thing letting it down is the speed of the Orange network at peak times which is variable at best.
There are mobile optimised versions of most of the websites I frequent so I can keep traffic and loading time down. Now I just have to wait for some cheaper mobile Internet tariffs.