So Edimax's Wi-Fi signal detector could prove rather invaluable. One flick of the power switch and the EW-7317LDg instantly starts scanning for nearby signals. If there are any wireless networks within range, you can get details: most importantly, whether they are secured or not. You can also check on the type of network and which channel they're working on, and a power indicator shows you how strong the signal is.

The signal detector doubles up as a USB 2.0 802.11g adapter, so having found all the available wireless networks, you can use the Edimax to device to connect to the one with the strongest signal.