Polymer
http://pslc.ws/macrog/kidsmac/wiap.htm

a website full of different projects and schematics (solar, microcontrollers, health, fun , april fool ..etc)
http://www.publicwarehouse.co.uk/schematics.php?schem_category=Microcontroller&page=3

circuits comparison
http://www.turneraudio.com.au/am-fm-radio-tuner-multiplex-decoder.htm