I've been thinking it would be a good idea to have subtitles to questions.
As well as specifying your questions title, you would (could) also specify a subtitle. This would be used on the main page below the title, instead of the first few lines of the question which we now see (as a fall back, when no subtitle has been specified, the first lines could be used, perhaps).
The benefits I see in this are,
The main title may be more succinct and more "catchy" than currently, whilst not worrying about losing any detail. As well as looking nicer, I believe this will prompt more people to view more questions and the more people you can get "through the door" into a question the better quality, the questions and answers will be (more answers/more edits/more votes). And that's the main point, right?
The first few lines of a question more often than not do not sum up the question correctly. This would provide an opportunity to provide a synopsis of the question, making the front page more uniform, and frankly I think, more useful. I, at least, and I am probably not the only one, have all but entirely lost the habit of reading the current question excerpts since they rarely contain information that's going to let me know whether I will find the question useful and/or can contribute to it. I read the title, and do or do not click through based on that anyway.
A subtitle/synopsis may be helpful for search terms, and results.
I know some are going to balk at my use of the term "catchy" in my first point, please be assured I'm not suggesting having non-descriptive titles. Just less involved ones with more detail below. It's hard sometimes to know where to stop with a title. You want all the detail there but don't want to repeat the whole question! This suggestion I think provides a nice medium.
It will be good to hear your thoughts.