- 74HC595
SPI 2 8bit out. Latched.
Futurlec
DAC
http://futurlec.com/Mini_DAC.shtml
RTC
http://www.maxim-ic.com/design_guides/en/REAL_TIME_CLOCKS_8.pdf
DS1307
DS1306 Real Time Clock
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2687
http://www.nearfuturelaboratory.com/2006/12/14/arduino-and-ds1306-real-time-clock/
Nike+iPod
http://www.sparkfun.com/commerce/product_info.php?products_id=8245
7 segment
74HC4511
http://www.sparkfun.com/commerce/tutorial_info.php?tutorials_id=47&sipp=1&page=6
ULN2003A (Driver)
Misc
http://www.mikrocontroller.net/articles/USB_IO_Expander