No, it's real. Both SDSoft and Anton Tomov (and potentially others) have apps that allow you to change the processor speed on the 6600:

SuperDave's: http://www.sdsoft.net/xdaiii/xda.asp
Anton Tomov: Google "Pocket Hack Master" -- he's re-doing his site.

Anyone with war stories on how either of these apps work in either extending battery life and/or increasing responsiveness would be most appreciated.

[edit: obviously higher speed means less battery life and vice-versa -- I'm not asking how it works, just how well]

dsl

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VZW XV6600WC ROM 2.03.00WWE
* stock radio, BT, and ExtROM *