Hmm, good idea I guess. I like them, gives every post that extra personal bit. And I usually don't read them more then once anyway. But I can imagine it would be a nice option to turn it off.
I have a rather lengthy list of quotations in my signature. Since the Obama election, I did eliminate one that was Bush/Cheney specific, but I did add another one in its place.
Now I don't post very many messages as Minnemooseus - Typically I post about one every few days. I also have the signature in the size=1 text size so that it is less prominent. Lastly, I deliberately don't activate the signature most of the time - I just sprinkle in into my messages occasionally.
My Adminnemooseus signature is quite bulky, but its content is a number of links and a long quotation intended to be moderation guidance and information. But I still often choose to not display that signature.
Moose
Professor, geology, Whatsamatta U
Evolution - Changes in the environment, caused by the interactions of the components of the environment.
"Do not meddle in the affairs of cats, for they are subtle and will piss on your computer." - Bruce Graham
"The modern conservative is engaged in one of man's oldest exercises in moral philosophy; that is, the search for a superior moral justification for selfishness." - John Kenneth Galbraith
"Yesterday on Fox News, commentator Glenn Beck said that he believes President Obama is a racist. To be fair, every time you watch Glenn Beck, it does get a little easier to hate white people." - Conan O'Brien
"I know a little about a lot of things, and a lot about a few things, but I'm highly ignorant about everything." - Moose