A short version of my paper was published in PRL, and was mentioned in Science. As you can guess, this made some people quite unhappy. After all, the version of DSR I argued to be ruled out to high precision due to incompatibility with well-confirmed physics of the standard model is the one that's been claimed for a decade to allow a first glimpse on quantum gravitational effects. Frankly, I'm not even happy myself the model doesn't work because I'd very much prefer would we be able to observe something and connect our research to experiment.
Since my paper was published, Giovanni Amelio-Camelia and Lee Smolin, who have both worked on DSR, put out a few papers attempting to find a flaw in my argument. You find these papers here, here and here. My replies to these papers are also on the arxiv, you find them here, here and, the most recent one from today, here. In a nutshell, Amelino-Camelia et al's argument is just wrong due to a mistake in the re-calculation of the constraint. Smolin's two papers are more interesting in that he's doing the smart thing: trying to find an assumption I've made that can be replaced or shown to be not fulfilled to find a way DSR might work. One has to give it to him, he is actually amazingly creative. So far however, neither of his arguments has worked, though they gave me something to think about I hadn't considered in my original paper. Note also that Smolin has meanwhile updated his paper from April, while I haven't come around to update my reply yet, so don't get confused.
In any case, I'm afraid this won't be the end of the story. I'm admittedly quite tired of the whole issue since I have nothing really to win here. I'm either wrong, then I'm wrong, or I'm right, then I'm wasting my time arguing about a model that's wrong. Anyway, if you have any questions about this discussion, that's the place to ask.