MacBook goes into Sleep Mode w/o me telling it to

An iPod-like image pops onto my screen with "Zzzz" coming out of it. Then my computer goes into sleep mode.
This has happened a couple times. Once, I did not have it plugged in. The other time (just now), it was plugged in. Neither time was my battery even close to low power. Neither time did I come close to touching something that would put the Mac to sleep. I have checked my power settings, and they are all correct. For instance, I have the power/screen not shutting off when it is plugged in.
Any ideas???

Got the exact same problem here - I have it plugged into power and my on-power setting says "never sleep" and yet keeps trying to go to sleep (actually I think it is shutdown) when I leave it alone for a hour or two. Most of the time I have stuff running that it can't close automatically so I come back to a window full off dialogs asking for quit confirmation.
Very irritating - is my Mac just trying to be green? Is it somehow thinking its in battery mode? Is there some more obscure setting that will prevent this?
Or is it just a bug...

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