Hemant has a really good post from somebody (she doesn't like people who aren't her friends using her name) on how to keep people from listening to or "hearing" your message about Jesus. It's bang on.
I do find it amusing how atheists are creeped out by knowing that in their hotel room, in THAT closed drawer, lies a Bible. It makes it seem like someone who would look under the bed at night. Other than that it's pretty good.