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
Always Show Recipient In iChat
In iChat under Snow Leopard, choosing View > Always Show Recipient Bar puts a buddy's status message and color at the top of any iChat window. It can also be used to select among multiple open iChat logins you have to send a message to that buddy, or to select among multiple accounts you have registered in Address Book for that buddy.
Enable AirDrop for All Macs with Lion
Check out the Take Control ebooks that expand on the topic in this article: