Fortunately for you, you have not bricked your phone, rather it is just stuck at the bootloader.
Check out this thread for how to get out of it:
http://forum.ppcgeeks.com/showthread.php?t=9229
And you may want to check out the sticky thread at the top of this Forum for more information:
http://forum.ppcgeeks.com/showthread.php?t=32382