I've noticed it too and have no idea how/why they are digging up these threads since the changeover to the new layout. But, reviving old threads never has bothered me. It does seem to irritate many users on many forums, and many forums are very 'over-the-top' about not allowing it - very paranoid for some reason. The thing is, topics come up and die down - 'out of sight, out of mind'. But later, somebody has the same question again. Sure, they can search for the old answers, but frequently, adding to the old thread will get new answers because people who answer have learned more themselves in the intervening time.

I actually like revisiting these 'reincarnations' to see what I may have said years ago on a subject - sometimes its funny, sometimes its just wrong compared to what I know now and every once in awhile it was right.