You could try a PDA if small and mobile is what you are looking for. Or you can call your broker over the phone to place orders - something a little nostalgic.
Hook up your PC to your Plasma TV and trade from the couch with a wireless keyboard. WIFI on your laptop @ the pool works well under an umbrella!
Honestly, I am thinking of trading from the couch, as my back hurts each day, sit there 30 min before AO till 1 or 2 hours after the end) Planning to move, that's why I am seeking suggestion on something more comfortable than a desk.
I try to stay on my feet as much as possible. I think it helps keep the energy level up. I also have three different chairs I use to keep my back from getting agitated. I think the ultimate would be a round room completely covered in monitors with a glass ceiling to let natural light in.
one and only time I rode a taxi in New York all the driver did for the whole journey was place orders with his broker on a mobile.