Had two complaints about the Nexus One Camera (which, in good light, takes remarkably good photos for a phone): First, I hated to have to press the shutter where the phone places it as it seemed a contorted motion; I wanted to be able to tap the screen anywhere. Second, I wanted in-camera saturation controls, so that I didn't have to process snaps I wanted to send to family or friends or to upload onto Picasa (and the in-camera settings were flat). Vignette, which costs about $2 solved both problems perfectly, and included all sorts of options beyond this. Can't recommend this software too highly. (Tried other apps that either froze the phone or didn't do what I wanted or both.)