I've now seen two HTC Touch devices with the same "smudge" on the screen. It appears in the centre, underneath the top layer of screen, and is roughly 3cm long. It's almost as if dust has collected in the middle of the screen or something.
I'd have thought nothing of it until I saw another device with the same thing. Has anyone else experienced this? It's not always visible - with the screen off, or in direct sunlight you can see it, but otherwise it's not noticeable.