Somehow I get the feeling that the influx of new (and good) questions is rather slow. So I have a few suggestions here for you that might give somebody a good idea how to spend a useful hour building the community.
Ask a good question yourself, even if you know the answer. For example, from @Caramdir, How to install a current version of TikZ?
Help with unanswered questions (old questions without upvoted answers). You can even place a small bounty to rub people the right way into providing a good answer.
Suggest, approve, edit and extend tag wikis. Some popular tags will certainly appreciate more love.
- Retag (carefully) old questions to better reflect our current tagging policy. (Take it easy though, as retagged questions are bumped to the top of the queue.)
- Improve the formatting of new questions (code, images, links).
- Nag meta.SO and staff with our favourite feature-requests and bugs. For example, if you can suggest a good 404/captcha image (also on meta).
Promote the site to attract new users, and by extension, questions. Some ideas:
Run a poll asking "Where did you learn about TeX & Friends?" This is to see whether the website has a sufficient exposure besides the broad SO/SE community. I would guess that basically everybody came from there, which neatly leads to...
"Do you have a friend or relative that frequents CTAN mailing list, or an IRC channel dedicated exclusively to LaTeX? Invite them today and win bonus 50 reputation!" (okay, probably without the fake rep award). But you get the idea. There are communities that already serve a similar goal as TeX-SE (I used to ask non-obvious stuff on #latex on irc.freenode.net) Perhaps some of them will be interested to give it a try and see whether they like it.
Inexperienced users are also likely to be interested in what we try to do here — it's no big secret that hunting info on some obscure package/style file, or trying to find a package that "does foo with bar" can be daunting for TeX beginners.
Share a question on Twitter to spread the word.
If you have more ideas, please share them.