To me, it sounds like web programming fits the bill of the type of skill that you say you want. The only question is whether it will be worth the effort to get through the learning curve (though you can basically get started doing stuff very fast), and dealing the frustration of problems that take time to solve.
I really have no idea how well the benefits and costs will match up to other things you can spend your time on, but it does seem that web programming skills could be an asset for your effort in the domains of nootropics and existential risk reduction. Here are a few random ideas that web programming could help you implement:
Every cause wants to be a cult... and also have a sweet website.
This is true. I actually have a lot of fun programming (when it's going well), and especially when I get to throw in graphics design stuff. (I really like nautiluses, so I wrote this script in Processing that made a photoshopped and edited nautilus lazily follow my mouse pointer around... it was sooooooo cute. Ahem.) I think I'll pick it up, but do so during the 'fun' hours of my day.
tl;dr: Some people on LW have a hard time finding worthwhile employment. Share advice and help them out!
Working sucks. I'd rather not work. But alas, a lot of the time, we have to choose between working and starvation. At the very least I'd like to minimize work. I'd like to work somewhere cheap and comfortable... you know, like on the beach in Thailand, like LW (ab)user Louie did. Then I could spend my spare time on things like self-improvement and ahem 'studying nootropics' all day. I'd like to travel, if possible, and not be chained to an iffy job. It'd be cool to have flexible hours. I've read The 4-Hour Work Week but it seemed kinda difficult and scary and... I just don't wanna do it. I can't code, and I'd rather not learn how to. At least, I'd rather not have my job depend on it. I never graduated from college. Hell, I never got my high school diploma, even. A team of medical experts has confirmed that my sleep cycle is of the Chaotic Evil variety. (For those who read HP:MoR, imagine Harry Potter Syndrome, except on crack. I bet a lot of people have similar sleep cycles.) I'm 18, and therefore automatically low status for employment purposes: I'm obviously much too young to make a good teacher, or store manager, or police officer. I can imagine having health problems, or severe social anxiety, or a nearly useless liberal arts degree, or just a general setback limiting my employment opportunities. And if it turned out that I wanted to work 14 hour days all of a sudden because I really needed the money, well then it'd be cool to have that option as well. Alas, none of this is possible, so I might as well just give up and keep on being stressed and feeling useless... or should I?
I bet a whole bunch of Less Wrongers aren't aware of chances for alternative employment. I myself hear myths of people who work via the internet, or blog for a living, or code an hour a day and still make enough to survive comfortably. Sites like elance and vworker (which looks kinda intimidating) exist, and I bet we could find others. Are there such people on Less Wrong that could tell us their secret? Do others know about how to snag one of these gigs? What sorts of skills are easiest to specialize in that could get returns in virtual work? Are virtual markets hard to break into? Can I just blog for an hour or two a day and afford to live a life of simplistic luxury in Thailand? Pretty much everyone on Less Wrong has exceptional writing ability: are there relatively well-paying writing gigs we could get? Alternatively, are there other non-internet jobs that people can break into that don't require tons of experience or great connections or that dreaded and inscrutable bane of nerds everywhere, 'people skills'? Share your knowledge or do some research and help Less Wrong become more happy, more productive, and more awesome!
Oh, and this is really important: we don't have to reinvent the wheel. As wedrifid demonstrated in the earlier Intelligence Amplification Open Thread, a link to an already existent forum is worth ten thousand words or more.