Re: DaneGuy - WinAdmin is definitely worth the $12 too! I use it and Teleport for emergencies. WinAdmin of course is limited to modern versions of MS Windows: Server 2000, 2003, Windows XP (Not Vista compatible yet). Teleport will connect to any VNC server, including old Windows 95/98 machines and of course any Mac with screen sharing turned on. It also has the advantage of allowing the person on the other end to see what you're working on (as a consultant that is important for me at times to show things to people remotely).
Re: Rockstarjoe - I would say that the latest update v1.1 of Teleport made the screen updating much more consistent. The old v1.0 would sometimes stop updating. I don't have a 3G phone or 3G access within 50 miles of me so I can't speak for 3G speeds unfortunately. I think you'll like the control scheme of Teleport better than Mocha. The screen acts more like a laptop touchpad- you move your finger around, and the screen scrolls to follow the cursor. Pick up your finger and the cursor arrow stays where it was placed, then you can tap ANYWHERE on the screen to activate the mouse click (without moving the cursor from the position you left it). Maybe I'm not describing it well enough but it is very effective in operation