PC has totally furthered my programming skills. It was already a hobby before and I had already worked on some forums in the past (that's how I got into programming), but being on PC there have been so many little tweaks and backend enhancements, or feature creation or tweaks, what have you.
Also just a lot about how the Internet works in general. As a web designer/programmer I feel like PC has taught me a lot about Internet society, in a way. What people expect and how to cater to certain crowds, etc.
Definitely been a great learning experience.