I have activated a vBulletin feature that allows you to rate threads on the forums from 1 to 5 stars. You can add your vote to the thread by clicking on the "rate thread" link at the top of the thread you are reading.
The threads can be sorted by rating so that you can read the ones that fellow members find most interesting and possibly relevant.
It should make the forums easier to use. Let me know if it works for you.