and that wireless connection is fast enough for p2p filesharing? what kind of bandwidth does sprint offer?

whether limewire works or not depends on whether that sprint internet connection works on all ports (specifically, port 6346) or just a select few (like web and mail). in any case, i don't think it has anything to do whether you connect the phone through usb or not.

again, i don't know what kind of bandwidth sprint offers, but i would assume you are better off using limewire over a wire connection (cable, lan, whatever). especially considering airtime.