I think it would be hilarious if everyone going to a protest wrote "No new taxes" or "T.E.A." or another short message on the palm of their hand. You can do this along with any other sign you want to bring.
First, I think this would be an impressive sight if enough people did it.
Second, I get tired of hearing how stupid Sarah Palin is. If she is so stupid, why does everyone (from the media to talk show hosts/comedians to the President of the U.S.) respond to her? Even if you don't agree with her, this would be a sly wink (Sarah style) at the irony of those who claim she is irrelevant while they obsess on everything she does.