Drag it to the Trash, do a Spotlight search for
lime, drag results to the Trash, search for
gnut, drag to the Trash. LimeWire is evil, and badly written. If you must use a P2P app (and most of them are evil, but some were created less evil then others), then Azeurus seems quite highly commended 'round here. I'd help you more, but I steer clear of the P2P stuff. It's 'orrible.
It keeps everything in the RAM yet still manages to be constantly writing to your hard drive. It messes with port settings and can down a wireless network in minutes. LimeWire is evil. It should have been made by Microsoft.