Travel Technology - Privacy Filter for laptop

Just purchased a privacy filter (made by 3m) for my laptop (IBM T40) will be nice to have when on the plane and in airports. Anyone heard of these or use them, anything similar out there?

www.3m.com/computerfilters

Yes - lots of our folks use them, generally on Thinkpads. They are very effective. If you are working with someone you need to remove them because off angle viewing is nearly impossible.