Also like Zooom very much. How did I live w/o it? (chorusing other feedback). Valuable the same way SideTrack is. Using OS X 10.5.1 on a PowerBook.

Zooom's way of using more of a gestural motion for resizing & moving windows w/o looking for a specific spot on a window w/ a mouse/trackpad will quickly pay for Zooom. Why? Because of less repetitive motion wear & tear on my body.

See freeware, WindowDragon, mentioned as an alternative. However I'm leery of haxies such as Unsanity's APE, which is required; haxies have sometimes created anomalies in my OS.

xPad: I can't resize docs by dragging the mouse inside the window; still have to grab the window's corner.

Oxford American Dictionary widget: Zooom isn't able to resize. Have to drag the corner of widget.

Works well w/ TextEdit, Finder, Safari, Firefox & VLC.

Safari: One of Zooom's default keyboard cmd, Cmd + Shift, interferes w/ Safari's keyboard command to open a link in new tab. So I had to change Zooom's default Move cmd in Prefs.

Photoshop CS: Can move images around w/ Zooom but when resizing window of opened image, window grows larger but image does not increase in size. Didn't take time to check if Zooom's keyboard resize cmd mirrored one of Photoshop's bazillion keyboard commands?