Joel Bezaire, a guest blogger at Church Marketing Sucks, posted an exceptional overview of what's wrong with most signs outside of churches. There's one in my neighborhood and if I had a dime for every wince emitted from my being as I passed it, I could afford to pay for all the church signs in America to be destroyed.
Beware: Once you read this great post, you may feel compelled to pass it on to your pastor. (Gasp! Church split!)