Rob Licuria, senior editor of Gold Derby (a site about predicting who's going to get awards), got Trent Reznor and Atticus Ross on Zoom and they all talked about the process of scoring Watchmen. The result is this half-hour clip embedded below, which includes a moment where Mr Licuria asks about working in the space of EDM for film scoring (l.o.l.). It sounds like Damon Lindelof was an ideal collaborator, and recording the score was a lot of fun, which is no surprise given how good it all turned out.
There's an article about it, but it doesn't really say much, so check out the interview, embedded below.