Learn about the Reware project, see how to easily install GNU/Linux and Pd on your Palm TX, and see some example projects.
We’ve been working since July on making it easy to hack old devices and run new software on them. Coming soon, a image for running Pd, Python, and Lua programs on PDAs, as well as a HOWTO for making Pd patches for 1-5G iPods. The key idea is to turn old PDAs, mobile phones, etc. into something like an Arduino, where you can easily upload your own code to the device.
For more info, check out our Reware dev site