Smart Growth America - http://www.smartgrowthamerica.org/jobs.html 
1. Legislative Associate
2. Communications Associate
3. Communications Fellow
The 4th position is director for the Smart Growth Leadership Institute (www.sgli.org ). That should be posted on the jobs website soon.
Please put the job title in the subject header. All applications and questions should be sent to jobs(at)smartgrowthamerica.org.