my current configuration is
asus s5 subnotebook with 12" screen, under 2 kg
ipaq 2215 coupled with SE z600 for internet access
works pretty well for me
and here is the configuration which will replace current devices soon:
thinkpad x40 better casing and HDD protection (durable than asus)
FS pocket loox 720 powerfull than 2215 built in wifi VGA
motorola v3 stylish, thin best design i have ever seen