Taliaferro v. Darby Township Zoning Board - 3rd Cir. - August 10, 2006
http://www.ca3.uscourts.gov/opinarch/052253p.pdf
This is an exclusionary zoning case that contains short summaries of a) federal standing law, including when a litigant can bring a case on behalf of a third party, and b) two kinds of absention, Younger and Rooker-Feldman.