I was writing an answer to a question just now, and I couldn't remember the formatting rule for bullets. I searched everywhere, but I couldn't find a link to the formatting reference. I only found it when I came here to ask this question, and saw that the quick formatting box is available when asking questions, but not while answering them. The same goes for the "preview" box below the editor.
To me, it makes sense to have both of these available on the question pages as well, so replies can have the same benefits as asking questions. I also think that the link to the formatting reference should be on the FAQ, since that's the first place I looked to try and find it, and I'm guessing that I wouldn't be alone in this.
What does everyone else think about this? What other ideas do you have for improving the usability of this site? I am well aware that Matt is limited on what he can do, but as usability experts, we should be able to come up with a list of things that could be taken to the StackOverflow guys as ways to improve the system.