If you mean the one with little bits of fiction about the fights (often written by the actual authors) that was Suvudu Cage Match. Unfortunately as far as I can tell from some googling, it looks like Penguin Random House got the rights to it a couple of years ago and now all the links just go to 404s.

ETA: Although if you're remembering one with Gideon Nav in it, it looks like this hasn't run that recently, so either it's running somewhere else or it's a different one.