Hey, a new forum mod idea!
A "solved button" that could only be pushed by the thread starter might make a nice little mod for this site, and for others. Maybe it already exists somewhere but I've never seen it.
Anyway, by doing that the person wouldn't have to push the edit button, and then go in and make the changes manually, and then have to save them. Instead, they'd simply click the "solved" button. The forum software would mark the thread solved and the [SOLVED] portion of all titles would then be formatted the same. Perhaps the original poster could push the button again to remove the "solved" if it should turn out that the problem wasn't solved afterall.
Just an idea to make it easier to get them marked solved. :)