Update: Question posted at Contest: Show Off Your Skillz in TeX & Friends [TeX.sx birthday].
Show off your LaTeX skillz
Show off the LaTeX knowledge you've gathered over the years, include things that a more-or-less everyday document can benefit from.
two-page (A4 oder letter) document
Should mainly be text, but content doesn't ...
I suggest to change "LaTeX" to "TeX" so it's a catch-all for everything (TeX is the underlying language; LaTeX/plain-tex/Context are macropackages/"formats").
Also, it doesn't make much sense to differentiate between engines (XeTeX, LuaTeX, pdfTeX), but it would make sense to differentiate between formats. Especially since you seem to confuse the meaning ...
A special article/issue specially released for this great celebration. We could have short interviews with some of our members, an overview of our community, moderators analysis, chatroom pearls, LaTeX jokes1, comments on questions, statistics, and so forth. We could also give this issue a name and publish it three or four times per ...
As 2 hours are gone by and the birthday is tomorrow, I go ahead and make suggestions. Feel free to edit, it's community wiki.
And more from the SE store, such as T-Shirts
Swag at some higher amount
The TeXbook or other books
A one year subscription of a TeX journal, such as TUGboat, Cahiers GUTenberg or DTK, ...
Who creates a nice screen-cast introducing the features of TeX.SX? This could be a nice demonstration, with a carefully selected demo question, wiki, meta discussion and chat transcript.
Teamwork is possible regarding conceptualizing, screen recording, if desired separate audio recording by another good speaker and ...
Great Blog Posts
Who creates a great blog post during a contest time? It could be during possibly 2 weeks (or 11 days?) starting from 11.11.11 on. There are great answers on this site which could lead to great blog posts! Or write about new topics. Several authors could get a prize.
We can honor earlier contributions of our already ...
I propose that the question be unlocked. Voting is long over, the current votes don't reflect the result of the contest anyway, but the answerers could still get some appreciation through votes and badges (not rep though as it is CW). It's pretty clear that this question usually wouldn't be allowed on tex.sx, so I don't think we need the lock for that reason....
The best tag wiki page
Very similar to my previous question
Who designs the best tag wiki?
I suggest designing tag wikis as part of the contests, since tag wiki pages can be excellent summaries and link collections of links to resources on this site and elsewhere.
What makes a good tag-wiki entry?
Redesigned Tags Page
I'm not sure how I feel about edits to submissions that happened after the deadline. I'm aware they are mostly typo-like corrections, but if we allow these kinds of edits, where do we draw the line? If you submit an application, you can't change typos afterwards, either. Thus, I'm strongly tempted to rollback these edits, just because there had been one week ...