Flutterby™! :

Shamefully stolen from Genehack, where John has obviously been more effective at keeping up with the Scary Devil Monastery than me, the Netizen Perl training materials. I've corresponded with Skud and seen her notes on developing the courses and based on that, without having done much more than glanced at them yet, can recommend them as good ways to learn about Un*x, Perl, CGI, and the like.