Advanced Linux users can really put their programming skills to the test with Tux Droid. Develop applications, code new daemons or even hack the firmware. Visit www.tuxisalive.com [1] to get started.
Shawn Powers [2] is the Associate Editor for Linux Journal. You might find him chatting on the IRC channel [3].
Links:
[1] http://www.tuxisalive.com
[2] http://www.brainofshawn.com
[3] http://www.linuxjournal.com/content/bringing-irc-back