After reading the blog post about the serial port challenges in Processing and the method for fixing them, I decided to download the IDE and try it myself. It seems to work reasonably well. I haven't quite managed to learn enough about the Arduino to understand how they use Processing or how limited their implementation of it is, but I was able to install and run the Arduino tool on my BeagleBoard after applying Koen's serial port library fix. I hope to use the tool to download applications onto my Trainer-xM, but I haven't yet been able to compile the examples natively because I haven't yet built avr-gcc.
This is highly related to my current personal project, which is working with Processing-JS. I've been talking a lot about a BeagleBoard Linux Education project, but haven't really kicked the project off after working with others on the scope. Mark Yoder's ECE497 class is where the most visible advancement seems to be taking place right now, though I've heard of several other educators also creating courses with the BeagleBoard, including the Stanford New Musical Controllers workshop.
Also, sorry about the delayed BeagleCast this week--resulting in some of the topics not being timely. I've had a challenge getting a call scheduled with Khasim to discuss Rowboat.