Love my Kensington Expert Mouse trackball. Much better than the thumb operated variety IMO.

IIRC the thumb operated ones are optimized for ergonomics while the finger operated ones for accuracy.

You could cut out the middle pieces and use Guava: http://gizmo5.com/guava.html?loc=guava

Guava looks cool, but seems to () cost you outgoing call fees in Gizmo5. SipSorcery allows you to configure the routings back through Google Voice so your outbound is free in the domestic US as well as inbound.

http://androinica.com/2009/07/24/android-google-voice-guava-...

I read that Guava is a fork or a simple copy of Sipdroid, which probably explains why Gizmo was ashamed to market it.