Magnetic car signs -what to say?

invalid@example.com (Judy), Judy
Mon, 16 May 2011 11:09:11 +0000

Hello,
Well I'm getting back into the game and have found a good friend to help me with the stuff I can't do due to my full-time JOB. We want to put signs on our vehicles but make it as cost effective as possible.
Just wondering what other people say to advertise and how many use car signs. I was thinking of just saying TRAVEL/MONEY/TIME FREEDOM and then have my website on the second line.
I want to get this done a.s.a.p so any suggestions would be great.
Oh and Happy New Year everyone.