I found these tiny (~1mm) creatures under a decaying board during a Habitat Hunters class at the 2008 Science Camp. According to Dr. Frans Janssens, a springtail specialist from Belgium who contacted me through Bugguide.net, they are Neanurinae, he wrote that the bumps on the body are typical for many neanurids. The white substance is slime mold, possibly its food source on that log.
Not being a "scientific purist", I wish these had a common name to go with them! Since the University of Tennessee at Knoxville is located only 25 miles away and these creatures are orange (the school's colors are orange and white), perhaps it could be called a UT Springtail! :)