Earlier someone mentioned DC Heroes Magic Supplement! Wow, thought I was the only one. Love that book for that game, and I really hope that if Steve Kenson ever gets around to a Mutants & Masterminds add-on dealing with mystical subjects only he will rip that book off left and right. DCH Magic is the best supplement ever produced, I've said it for years.
And maybe it's my love of the dwarves and never liking how they got shafted in 1e and 2e, but one of my other faves that I didn't see anyone mention yet is GR's "Hammer and Helm".