If you will notice there are now "Tag" boxes that appear on the Forums and the threads on Mustang Evolution.
Basically, when you create a new thread, you will be given the option to specify "tags" for it. Tags are words (or short phrases) that define a thread. If your thread is about the 2009 ford mustang some tags you might assign to the thread would be "2009" "2009 Mustang" "2009 Ford Mustang" etc etc.
It will take a little bit of time for us to build up a good tag database, but as we do, you will be able to search or browse various tags that interest you. As you are reading threads, you will see tags listed at the top of them. If you click on a tag, you will be taken to a page listing other threads with that same tag. You can also search for certain tags in the regular Search dropdown, and you can check the "hottest" tags by going to the Tags Page
. The bigger the tag is in the Tag Cloud block, the "hotter" it is...or the more popular it has been lately.
If you have any questions let me know!