Microsoft probably shit a brick when they saw Spotlight (fast, easy, finds the things you're looking for), so Vista Had To Have The Same.

Only it sucks, like the rest of Vista (which uses >500MB memory when it's sitting there gurning at you, btw). Even the 3D desktop window sorter thing (think Exposé, but crap) is horrible and slow. The much vaunted "glass effect" is a bit pointless. The new Start menu will confuse the crap out of everyone. Getting asked for your admin password continuously gets old fast (it did it to me every time the wlan connection came up).

It does ship with some nice wallpaper, though, and I like the new system font.