There is an anonymously supported ad campaign that is attracting a lot of attention in a number of states. There's even a second campaign for youth (wuzupgod.com). The websites now have a lot more info and have the stories and messages behind the sayings. For more info, check out the sites and some articles...
The 'official' websites about the campaign...
- God Speaks - http://www.godspeaks.org/
- Wuzup God? - http://www.wuzupgod.com/
... or some articles.
FWIW, you can get html/javascript code to use this little message banner at the God Speaks site.
In a similar vein, see Church Signs.