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. follow link
View Silver Screen Media on Your Apple TV from another Disk
Want to watch movies via Silver Screen that aren't in your Movies folder? Just create an alias in your Movies directory and select that as your Media Directory in Silver Screen's preferences. It will even be automatically mounted if needed when the folder is browsed in Silver Screen. To make the alias, mount the server or other disk in the Finder, locate the folder containing the movies and Command-Option-drag the folder's icon into your Movies directory.
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Enable AirDrop for All Macs with Lion
Check out the Take Control ebooks that expand on the topic in this article: