The Genius Guide to Feats of Runic Might (PFRPG) PDF
I just recently picked this up and it's so cool I had to chime in. Really a great concept, flavor and implementation (along with Feats of Runic Might II).
I could see someone using these for extra flavor to a Runelords campaign, as already stated by another reviewer. I'm currently running a Pathfinder/Eberron campaign, these will add nice flavor to the Draconic Prophecy theme.