I am loving this program. I've set it up so I have to hold down the Ctrl key to switch between machines - it keeps me from going off the side of the screen by accident.
Tip: If you use the Dock on the side of your display, don't have it on the same side you drag through when moving between machines. I usually have the Dock on the bottom, but is was on the side when I booted into Leopard. Just too distracting having the Dock respond while you're moving between Macs. (Leopard isn't bad at all on a dual 500 MHz Power Mac G4!)
I've posted my clipboard problem to the Teleport forum. Hoping to find an answer soon. I'll share it here.