New In OS X Leopard: Spotlight
Okay, so Spotlight actually debuted back in Tiger. But if you'll give it a try, I'll think you'll find that the Leopard version to be an entirely different animal...
(Sorry, but I just couldn't resist.)
In Tiger, Spotlight was slow, awkward, and in some cases didn't even succeed at its main job of finding files.
In Leopard, Spotlight is now a fast, lean, mean, file-finding machine. Plus a lot more.