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Great to hear from you, and sorry for the slow response.
I checked the Woolman site - looks like a great place to learn.
MediaWiki, which is our biggest area of work, is written in PHP, like WordPress. Not as user-friendly as WordPress, but an extremely powerful platform.
"mesh networking, distributed social networks, low power FM, encryption, etc.." - that's all great stuff, and you'll find people in the Appropedia community who are into these. It's not really within the scope of the tech internship, but if you wanted to contribute knowledge about these subjects, we'd certainly support that.
We have a task management system here for site development: https://secure.bettermeans.com/projects/181/dashboard - I planned to pick out some tasks that might be interesting to you, but I wonder if you're ok to have a skim through yourself? We have a bunch of projects there, and will have some more soon. We have a dev site too, for testing - whatissustainability dot org (we don't leave the raw link here, to avoid confusion with the real site).
I hope that's of interest to you. If you have any questions, don't hesitate to ask.
If you're still interested, pick one or two small things to look at first from that BetterMeans dashboard. Go for the higher priority items in preference (green up arrow on the right). Also see this: Appropedia:Tech intern team/Tour - that can help get you started. Feel free to check out the site, or drop a note at the Village Pump. I'll leave our standard welcome below, as well. Thanks for getting in touch! --Chriswaterguy 11:01, 24 September 2011 (PDT)
You mentioned CSS as one of your areas, so I want to let you know about User:RichardF. He's been taking initiative with work around layout and appearance on the site, though not directly with CSS. He's revamped our Portals and gallery layout, and suggested an alternative table class. Not sure how close that is to CSS work, but might be of interest.
Cheers --Chriswaterguy 01:09, 25 September 2011 (PDT)