Wi-Fi Widget is a 1x1 open source home screen widget that allows you to connect/disconnect to/from Wi-Fi networks.
The difference between this widget and the Power Control widget is that this shows the SSID of the network you're connected to. This is a very useful feature for me, so it may be useful for you to.
If the widget doesn't work for you, please contact me by e-mail.
I'm creating a tutorial to explain how I developed this widget and it will be posted at http://androidappdev.org.
If you like my work and would like to support me, feel free to buy the donate version.
Added support for all screen sizes and resolutions.