I’ve been struggling trying to create the icons that are used for different tabs on an iPhone app.

The difficulty is, is that each image is a PNG, but alpha channels are used to represent their selected state.
I’ve just come across this fab tool, that takes all the pain away, using 30x30 png images, I was able to create a really nice set of icons.
http://scottpenberthy.com/tab/
(Respect)