There's one point Glenn forgot to mention: GIF files support multiple "frames," which means they can be used for simple animation. I believe this feature is exclusive to GIF since, until Netscape supported it, no one had bothered with this rather obscure part of the GIF specification. PNG was designed before Netscape supported multi-frame GIFs, and the designers didn't see the point of supporting this completely unused feature. Pity.
Move Multiple Windows Simultaneously in Spaces
Command-drag a window in Spaces to move all windows associated with the dragged window's application to a new space. Control-drag will do the same thing, and will also preserve the same screen position in the space in which you drop the windows.
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