I use it with an iPad.
http://moi3d.com/forum/index.php?webtag=MOI&msg=3827.10 ;-)

-> WLAN /Wi-Fi it is very fast.
-> 3G performance is slower

(A small remote delay is present, depending on "connection speed".)

The app is available: iPhone or iPod touch / iPad / Android /Palm Pre
http://www.splashtop.com/remote/availability

Splashtop Streamer is free:
http://www.splashtop.com/remote/download

After "connecting" you can see your computer
desktop and you can do what ever you want.
I use an alu pen, called just mobile:
http://www.just-mobile.eu/alupen.html