The Raspberry Pi is a very inexpensive, tiny computer running Raspbian (a Debian-based distro), and other Linux ditributions.
Many people in the Pd community have been experimenting with this platform in the past months, and I am happy to announce that it is now ready for real-time I/O audio (in case you didn't know...) !
I (and other Pd users) managed to go down to 10 ms latency without audio dropouts with an external USB soundcard.
I made a few guitar effects which run fine on it (with 16 ms latency though, because i use a phase-vocoder for one of them!). You can watch the video here :
Stay tuned on my blog for more instructions if you are interested.