Umm, i know that Disk Utility can resize GUID partitions, but i think it will erase it. If you think about resizing partition @MBR maybe you`ll find this usefull :

http://ubuntuforums.org/showthread.php?t=89960

Seems to work, it`s quite easy and free.

PS. If you would find any Mac app which can resize partition live - let me know, i could use the tool aswell

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