Links often change, so please make sure that you report any broken links.
Here you will find some electronics links from other people that are working on electronic rocket payload.
||This site is selling some interesting rocket altimeters that are compatible with the Arduino developement environment. Those are quite advanced altimeters with flight data logging that are affordable compear to other commercial altimeters.
An advanced arduino project from a German rocketer. It is using small Arduino board to build advanced tiny altimeters.
Here you will find some programming links regarding the Atmel microcontrolers
||All the Atmel microcontrolleurs and some useful data so that you can compear them
||The Arduino main page, an excellent site and opensource project
Misc rocketry links