Glenn Fleishman explains a tiny tweak you can make in Lion that enables AirDrop peer-to-peer file exchange to work over local area Ethernet and wireless networks. This enables AirDrop for older Macs that lack the right Wi-Fi chips to work with AirDrop out of the box, and it also adds wired LAN access for even those Macs that do have supported Wi-Fi chips.
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Adam C. Engst
Enable AirDrop for All Macs with Lion
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Get real-world advice from Wi-Fi wizard Glenn Fleishman on setting up a wireless network using Apple's 802.11n-enabled AirPort Express, AirPort Extreme, or Time Capsule base station. Find help with maximizing performance, extending range, connecting multiple base stations, complex Internet configs, and sharing USB disks and printers.