This just out: http://arxiv.org/hep-th/0401087 Joao Magueijo <firstname.lastname@example.org> Lee Smolin "String theories with deformed energy momentum relations, and a possible non-tachyonic bosonic string" Smolin is one of the inventors of Loop gravity but also has authored and co-authored a number of string papers as well. Here they are basically saying "Hey look, GLAST goes into orbit and begins observations in 2006---providing the first real test of some variant(s) of Loop quantum gravity. String should get ready for this by making its predictions too! And then, because they are such helpful people, and because they see that the string regulars have neglected to do it, they tinker around with seeing how to get the string machinery to come out with some predictions that GLAST, or maybe some high-energy cosmic ray project might test. Other takes on the paper are welcome. What I am picking up on is their looking for dispersion relations like the energy-dependent speed of light---and, failing to find that, other effects kindred to it.