I played with the idea of implementing a little Forth for the PRU, but wasted a weekend looking for fast multiply and divide algorithms (IIRC, it can only do addition, subtraction & left/right-shift). It's a neat little platform, but at the end of the day I've not found any really pressing need to use it.

That doesn't mean others haven't, of course — I'm very much a software guy these days. Kinda wish I'd had a BeagleBone back when I was a kid, designing & soldering my own stuff: I bet it'd have been awesome. Can't even imagine what Forrest M. Mims could come up with using one of them as a platform!