There are some people claiming that even at $29 for a full new version of an OS, Snow Leopard isn’t worth the money. These people are, to put it charitably, uninformed.
If you want to get an idea why, go check out this meg-review of Snow Leopard by the uber-geeks at Ars Technica:
This is the most complete review I’ve seen yet. Parts of it are technical. Very technical. But even the technical bits give you a flavor of how much work went into Snow Leopard and how focused Apple was on improving the overall user experience by reducing the time we have to wait for stuff to get done.