User Interface Testing

It will be a question of a tool that today helps me test the user interface. Simple as a corner of the house, but saves so much time!

I am sure that many people know this, but for me it became just a revelation. A kind of panacea. He even decided to record his first videocast:


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Ps. Opened topic for everyone. I think people from other platforms are also curious about how we are spoiled by the tools for development.

PS2. The subject has hacked the mind. Below will add useful links on the topic, suggested in the comments.

GTM cognized unit tests for UI
Native tools from iPhone SDK (Unit Testing Applications)