A way to make this more convenient is to use a QR Code, which can be scanned to make a device connect to your wireless lan automatically. This actually works for many mobile devices, especially Android smartphones.
A simple Python script that can be used to create such a QR code can be downloaded here. It requires qrencode and Imagemagick. An Android QR code reader, which I have found useful is Barcode Scanner.
The script generates a printable pdf that looks like the following:
