End of the article gave me a great idea for an iPad 2 app. A fake (or real) spreadsheet or RSS feed reader with a small camera window (quickly closable). It would revolutionize the disguising of ". . .furtive glances at the name badges of passers-by while sipping coffee in the conference center."
There are similar apps for the iPhone of course, but the iPad should make a much better 'furtive glance" shield.