An early Jurassic dinosaur track site in New Jersey is currently in danger of being destroyed by development for a new set of high-end condos. The track site is directly adjacent to a park, and if the park boundary is extended only 200 feet, the locality can be preserved for posterity (and I believe *most* or *some* of the condo development can continue as well, so that would be more or less a win-win for both sides).
While many folks don't believe in online petitions, the "Help Save Capitola!" petition catalyzed opposition in 2003 and 2004 to help defeat the seawall that would have been built along the Capitola cliffs; that locality was saved, due in part to the petition I drafted during my freshmen year of college.
Anyway, the petition can be viewed here and signed here. I highly suggest anyone worth their salt as a paleontologist or fossil enthusiast to sign the petition; it broke 1000 signatures friday morning, and as of now, has 1804 signatures.