I've been leaving PC on overnight periodically, uploading my iTunes collection to the new Google Music beta online storage.
I come in this morning- the program had finally finished- over 6400 songs- and I noticed that the screen was vibrating. It does about 500 a night or so.
the 'Google' logo on the web page. Even the icons in the systray. Back and forth. very subtlety.
A reboot, and it's gone.