Power Support Films
Hi, first post...
I have the Power Support anti-glare film on my iPod touch and it is superb. It *Does* slightly reduce the sharpness but only very very slightly, and it has the advantage of making it virtually finger-print-proof.
YMMV but Power Support sell a film for the plastic macbooks, and I would think (but haven't checked) that this would work for the Air as they have the same advertised screen dimensions. I've not seen it in the flesh but if it's the same as the iPod one it would be excellent.
On the other hand, the Air and White Mabook aren't too bad. It's only the alu ones that are ultra shiny.
The Power Support films aren't available in the UK as far as I can tell (but presumably could import). They were available direct from Power Support's website (google), and from the US Apple Store, and they were only $35 or something like that.