Does the click-to-focus thing in the iPhone photo app actually do anything? It seems like when I use it, then hit fire half a second later, it (often) gets a new focus-lock and (always) gets a new exposure-lock before taking the picture, so what's the point?

Also, I found a use for the HDR button: it's a way of forcing overexposure. The "HDR" image will be shit, but it also saves another image that is a couple of stops brighter.