Hmm, think it might have something to do with my logitech harmony remote adapter.
I unplugged it and then turned it back on to make sure everything was good and all seemed alright. I used my remote to turn it off...and the same thing happened. I got up and pressed the power button, it beeped, and then the green light kept blinking. I held down the power button and still nothing. I finally unplugged it again.
After plugging it back in I turned the PS3 on and then used the Dualshock 3 to turn it off and it turned off just fine.