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I haven't found a tap to unlock work yet on ios4 and I feel like I've tried all of them. Maybe I missed one though. Lockinfo is the way to go
 
Not sure about the arrow but i thought the text was located in System/Library/CoreServices/Springboard.app/

Thanks for that location. I've been watching a lot of the new Dr. Who season so I changed my lock slider to say "geronimo!"
 
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