First off, someone points out that those fancy digital billboards that are constantly shifting images might be a safety hazard. Where have I heard that before? Oh right, when I said it.

Second, there's speculation - centered around a patent filing - that Google might be developing an automated system for the selling of and eventual display of ads on these digital billboards. Advertisers would bid on keywords like they do now in AdWords but then specify where and when they want those ads to be displayed.

As usual, Google getting into this would be a game-changer. I'm betting such a move would lead to the sudden creation of a ton more signs in order to capitalize on the opportunities suddenly available.