Stigy
Some say...
Check out this awesome app I just found via Reddit: https://market.android.com/details?id=com.sudomakemeanapp.wifiqr&hl=en
The easiest way to have your friends and family connect to your WiFi network!
WiFi QR Share enables you to easily create WiFi QR code images. Your friends and family can scan these QR codes (with the app "Barcode Scanner") right off of your phone's display to let them join your network without having to type anything at all, no matter how long or complicated your password is.