We've had some long, complex and LaTeX-heavy answers recently, and so I'm suggesting that we create a thread a la this post on Math.SE. I doubt this will be used much, but there's a chance it could work in the future.
In general, see the ones posted on the Math thread. Here are some of the important points:
- Make posts community wiki.
- Do not make too many - perhaps set a limit here.
- Do not expect your work to stay alive forever, escaping deletion.
- When done, add a message indicating that the post is free, and delete your old work.