I'm sure I read this somewhere, but what's the effect PG uses at the start of Get Out of My Yard? It's not some kind of delay / looper with modulation, is it? He's changing the pitch and slowing it down at the same time.

It;s just delay, set with a high amount or infinite repeats. Then the "pitch" is changed by altering the delay time. Watch this http://www.youtube.com/watch?v=9_UizLYgt1Q
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Boss DD-3, see above video. He manually adjusts it while playing to get that weird effect.
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or you can do it the ghetto way:
rub the side of a coin in the strings in a circular motion
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