We will test this right now on our computers and let you know immediately.

Ok here's what we found out. If you download the game (use the link from the confirmation email you received when you bought it) to a second computer, then when you run the game click on "already paid..." in the bottom-right, then enter the original email address from the confirmation email, AND the unlock key from that email, you will have it activated on two computers. Looks like 5 reactivations total, including the first time you activated it. Hooray! Enjoy.

Treo 600 user: please send me a PM and I will see what I can do.