I recently bought a scratch/dent i3 11z (1121). I already had dual 23" 1080p monitors on my desk so thought I might plug both into the laptop simultaneously. Turns out its a supported mode in Windows 7 (default driver software) AND in Ubuntu 10.10.
In Ubuntu 10.10, when configuring Displays, it actually shows all 3 screens (built-in laptop display plus 2 externals) but when trying to have all 3 on at same time it bonks and just goes back to the 2 external displays. Perhaps a limitation of the sw and/or hw.