I'm currently evaluating features and enhancements for Forum 1.0 (and in directly the upgrade of the forum on this site) and one usage model that is coming out is people editing the title of threads to show whether something is solved.
My question to you guys and girls is would you like a slightly more official way of doing that? Say perhaps a checkbox to mark whether a thread is solved or not. By doing this we could highlight unsolved posts. I remember having a discussion about a stack overflow type model which I think could work well as a mode in the forum, it may even be another module on top of the forum.
Anyway I would love to hear your feedback about any issues you have with the current setup and any ideas. Got a lot of cool functionality coming to the forum in 1.0 so stay tuned!