YouTube's full og 'em, just search "xgl demo"

It includes expose-clone, multiple desktops oriented around a cube, wobbliness, pretty effects, slick-looking transparency all-over the place and...pretty.

Here's the announcement screencast: http://people.freedesktop.org/~davidr/xgl-demo1.xvid.avi

(For the record, I think my setup looks better And I'm running on Intel integrated graphics).