This is a really trivial question, but I've seen different conventions and some edits regarding which is correct, so I'm curious:
Should question titles be
Title Cased or
Not sure if it'll stay for long, but for this question title (Which is currently appearing for me) on the right hand side:
is just that much harder to read because of the title casing. Maybe harder is not the right word, but it just looks less desirable.
It's really more a question than a title -- use sentence case.
Of course, this leaves me wondering if we could call that field something better than "Title" on the "Ask Question" page. I can't think of anything better, though. :/