princeton "noosphere" project:
http://noosphere.princeton.edu/

http://code.google.com/p/avr-hardware-random-number-generation/wiki/AvalancheNoise

http://forums.hackaday.com/viewtopic.php?f=2&t=2428

http://holdenc.altervista.org/chua/

http://holdenc.altervista.org/avalanche/

http://web.jfet.org/hw-rng.html

http://www.gniibe.org/memo/development/gnuk/rng/pqrng
http://www.gniibe.org/memo/development/gnuk/rng/neug
http://lists.gnupg.org/pipermail/gnupg-devel/2011-July/026146.html
http://no-passwd.net/
http://www.seeedstudio.com/wiki/index.php?title=FST-01

http://emergent.unpythonic.net/01257868826

arduino ADC no good for true random numbers?
http://www.academia.edu/1161820/Ardrand_The_Arduino_as_a_Hardware_Random-Number_Generator#outer_page_20

TinyMT (mersine twister), a very small-state PRNG implementation

avalanche:
http://robseward.com/itp/adv_tech/random_generator/