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Yep! Here's some instructions on how it was done. The underlying app, ScreenKnock, still works on Lion.

Instructions: http://maketecheasier.com/smack-your-mac-to-switch-spaces/20...

ScreenKnock: http://welcometochrisworld.com/2008/10/02/screen-knock/

Hehe, I remember trying out the predecessor, SmackBook: http://blog.medallia.com/2006/05/smacbook_pro.html

I also remember installing a bunch of similar little toys built around the same time using this sensor - MacSaber: http://blog.isnoop.net/2006/05/20/macsaber-turn-your-mac-int... SMSRotateD: http://osxbook.com/software/sms/smsrotated/ SeisMac: http://www.suitable.com/tools/seismac.html

(Amusing to look back on this since I work on Cydia now, which is all about non-app software like neat accelerometer toys [one of the more popular packages is Graviboard], just on little bitty devices I wouldn't have imagined back in 2006.)

Thanks for linking that, really neat. I just ran it, and after configuring to use command-arrows to switch spaces, it works really well on my MacBook.

In fact, rather than hitting the side of the screen, just a gentle tilt to the left or right is enough to switch spaces. The dynamic feels really good.

Ah ha! Yes, I knew it must have been a residual memory and not my own idea.

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