Download AquaSnap, to have Win7 Aero Snap and Shake on older Windows
AquaSnap is a free program enhancing the way you arrange windows on your Desktop. It lets you snap windows to the edges or to the corners of the desktop simply by dragging and dropping them where you want.
AquaSnap can replace the Aero Snap and Aero Shake features of Windows 7 and is compatible with all Windows versions, consuming little memory and CPU.
Drag a window to the border of your desktop, and this window will be snapped and resized to fit one half of the screen. Drag this window to a corner, it will be snapped to fit one quarter. Shake a window, and this window will stay always on top.
Features: Can resize windows to half screen and quarter screen * Multi-monitor compatible. * Works with child windows of Multiple Document Interface (MDI). * Skinnable interface. * Multilingual GUI (English, French, German, Spanish, Hungarian, Turkish, Japanese, Korean).
AquaSnap will not let you define keyboard shortcuts for performing those tasks, and during my testings (on Windows 7) it seemed rather unstable and unreliable.