http://revision3.com/systm/avr101 has a project that might be worthwhile.
Oh, and maybe people aren't submitting anything because they're getting errors when they go to the site. Certainly, almost every page I go to has errors like:
"Warning: include(view.inc) [function.include]: failed to open stream: Too many open files in /home/zendurl/public_html/d/diagrams/All.php on line 30
Warning: include() [function.include]: Failed opening 'view.inc' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/zendurl/public_html/d/diagrams/All.php on line 30"