Graphics look really nice!
As for the "mouse arm disease", you might look up RSI instead. I've had this sort of thing happen a few times on and off in my life, and every time it's been due to a poor positioning of the keyboard/mouse. Over the past week, for example, my wrists started killing me (after moving to a different room/desk). I raised my chair up as much as it could go (legs barely fit under KB tray), and now the pains has gone away completely--and I've actually been spending *more* time on the computer, recently.
You also might look at moving away from using the mouse when possible. In the vast majority of cases it hinders producivity substantially anyway. Programs, in particular ones geared towards programmers/nerds, will tend to offer many more shortcuts than you realize. Often times you can do *everything* without touching a mouse (or missing the use of it).
I can't remember if you use the Flash IDE or not, but FlashDevelop is good when it comes to that stuff. I'm sure Flex Builder is as well, and if I had to guess, the Flash IDE is probably the worst of the bunch. *shrug*