These forums have an interesting "rating" feature that allows you to "rate" a thread -- basically voting on how good or useful it is. This may be irrelevant in many cases, but who knows -- it could be useful for technical issues or fun in the less technical forums.

To rate a thread:

At the top of the thread, above the first message, click on the "Rate Thread" link that's on the right side of the menu bar. Then click select your rating and "Vote now".

Ratings will show up as stars next to the threads, if enough people vote on it (if you just vote on your own post, it probably won't count).