Promoting With Pens

My new business cards just came in the mail. I have my strapline (The Write Words For You) all over them. Now I'm wondering whether I need a promotional pen.

People love free pens; I don't know why. If you have pens to give away you can guarantee that people will pick them up and use them. All that subliminal advertising must be good for your business.

What gimmicks do you use to promote your business? I could use a few ideas.