My computer will, at random times, almost or completely go into screensaver mode, and either go black for a few seconds, start my screensaver, or go directly to the 'log back in' screen.

This happens when I'm literally DOING something, like typing or moving my mouse. When I'm in no way not doing anything on my computer. Any thoughts on why?
Specs: Version 10.6.7, 2.13GHz Intel Core 2 Duo, 4 GB.

This might sound silly, but I'd check your Exposé settings: System Preferences > Exposé & Spaces > Exposé
It's just possible you've set up a hot corner to put your computer into sleep mode when the mouse wanders in that direction.
Bob

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