Gate opener is an application for Android. It can be configured to send an arbitrary HTTP command when it encounters a set wifi network.
I intend to use it for logging on to Internode wifi hotspots.
The idea came from the following conversation in #android on freenode:
10:15 rsteckler: how would you open a garage door with an android? Is the
garage door hooked up to the home network or something?
10:16 @SanMehat: yeah
10:16 rsteckler: rad
10:16 @SanMehat: it makes an http:// request once it connects to a specific
wifi network its scanning for
They are referring to android-garage-opener