I bought the screen protector(don't know the brand) for $10, together with my IXUS 800 at MS Color.
I hestitated when the staff recommended a screen protector, because I feel it is not needed.
Then he showed me his displayed IXUS 800 with colour band on the LCD, caused by finger mark/nose mark. And said that he could not get rid of it.
Thats when I agree to get the screen protector, provided he help me paste it as well.