Windows 7 introduces some mouse gestures features: Aero Shake and Aero Snap.
Drag a window and shake your mouse: all background windows instantly become minimized.
Shake again: minimized windows are restored.
(Also available with shortcut: Win + Home)
Aero Snaps allows you to position and resize windows by dragging windows to the edge of the screen.
Note: if you are more a “hotkeys” person here are some shortcuts:
Win + left/right arrow: dock left/right
Win + shift + left/right arrow: same but across multi-screens!
Win + up/down arrow: maximizes and restores / minimizes
Win + shift + up/down arrow: maximizes and restores vertical size
Also I noticed that window borders keeps transparency even when maximized (unlike Windows Vista).
And to conclude: no, there is no 3d cube desktop manager in Windows 7, which is something people are very much interested; if I believe my stats this 2 years old page gets more 1000 visitors per month on my blog: