Prentice-Hall International-UK made a mistake in the online offer made to TidBITS readers for my book. They have been offering 20 percent off 18.50 pounds, when in fact the base price they should have been charging was 27.50 pounds, which is now in effect. Sorry for the mistake, and if you lucked out on the lower price, congratulations.
Option-Click AirPort Menu for Network Details
If you hold down the Option key while clicking the AirPort menu in Mac OS X 10.5 Leopard, you'll see not just the names of nearby Wi-Fi networks, but additional details about the selected network. Details include the MAC address of the network, the channel used by the base station, the signal strength (a negative number; the closer to zero it is, the stronger the signal), and the transmit rate in megabits per second showing actual network throughput. If you hover the cursor over the name of a network to which you're not connected, a little yellow pop-up shows the signal strength and type of encryption.