I'm just passing on info that would be much appreciated. This is not my work.
As of 8/15/2011 4pm Central this will unlock your bootloader, but you will lose 4G. They are working on a fix, which I am sure will happen, just want all to be knowledgeable of risks involved. It's not a permanent(forever) loss from what is being relayed.
Good Luck.
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http://forum.xda-developers.com/showthread.php?t=1216097