There are many (hidden) features which are not documented, at least not in a single point where one can find them all.

I always wondered what is the way to create polls. You know, with the up/down voting options, etc.

Also, how to quote in comments, and how to post code having it displayed in a fixed width font.

There are probably more features which I, and probably other members of the community would appreciate if they were documented.

(although, this poll thing might be risky, if some might misuse it, and will turn this site into a stupid poll site, but I am not afraid too much since the signal-vs-noise ratio has been kept very well ever since).