There’s a dated post (1/5/09) at Moodle.org by Helen Foster about the Introduction to Moodle Programming course. The course is still up, open and running and looks to be a great overview ramping up to programming with Moodle.
If you’re familiar with PHP and SQL and want to lend a hand or customize Moodle a bit, check it out. Note that you will need to register at Moodle.org to participate.
The original post: http://moodle.org/mod/forum/discuss.php?d=113342
The course was