So, tonight I wanted to know if someone was trying to IM me while I was in the other room (important stuff, you know...). Searching for arduino/applescript stuff didn't turn up too much other than people searching for the same in a few forums or blog posts. And, not that this is especially smart of me, but I thought I'd post it here anyway. I based my arduino code off of the serial_comm_basic sketch just w/ a little more fun flash fadiness. Then I found the todbot.com arduino-serial command line tool:http://todbot.com/blog/2006/12/06/arduino-serial-c-code-to-talk-to-arduino/
at which point it becomes very easy.. in Applescript do something like this:
do shell script "/Applications/arduino-0007/serialCommand/arduino-serial -b 19200 -p /dev/cu.usbserial-0B2 -s H"
and that's it. You can process info, create UIs, even read in info from arduino using shell commands like that in applescript and applescript studio.
I downloaded iCAR (iChat Auto Reply) and executed the applescript from there (it also does shell commands, but I didn't realize that until after I did this).
So, yeah, not rocket science, but if you're looking for a quick and dirty Applescript / Arduino combo - that may work for you.