Although you can search for all threads with 0 reply's, it is not exactly a simple or easy task. Adding a button, similar to the "What's New?" button that would search for all unanswered threads would help to make sure less threads go unanswered. This would have many benefits including keeping new members who's threads have fallen bellow the typically checked ranges, to have their questions answered and increase their faith in the forum.

This should be a rather simple soultion to implement, what does everyone else think of this?