I used to have the same problem with my old 3G (I now have the iPhone 4). I think the problem started because I was either using it too much or I would press the button too hard. I think the home button wears out if you don't click on it well.
It's definitely a problem. It was frustrating that my clicks wouldn't register. I would have to press the button firmly and more than once for it to register. If you would press it normally, it would click (sound) but it wouldn't register the click.
My solution: sold it and bought the iPhone 4
It's definitely a problem. It was frustrating that my clicks wouldn't register. I would have to press the button firmly and more than once for it to register. If you would press it normally, it would click (sound) but it wouldn't register the click.
My solution: sold it and bought the iPhone 4