If there was a downside to The Day After Ragnarok it's that there just wasn't enough of it. I loved the book, and there's certainly enough there to run a campaign or three, but I wish there was more. In the very near future, there will be.
Atomic Overmind has announced that Tehran: Nest of Spies -- the first supplement for The Day After Ragnarok -- is releasing November 30, 2009 as a PDF source book for Savage Worlds and HERO 6th Edition.
Here's their introductory blurb for the book:
In the wake of the Serpentfall, Persia lies balanced between the desperate British Empire and the malevolent Soviet Union. Both powers have toyed with Persia in the past; both would gladly swallow it whole in the present. Their machinations reach a fever pitch in Persia’s historic capital …Tehran: Nest of Spies!
I have to admit that when I was thinking of source books I'd like to see for Ragnarok, I never thought of the Middle East. But it makes sense -- it's the stage for the new cold war between the Soviet Union and the British Empire, and it sets up all manner of scheming and super spy action (not to mention the potential for nifty new ophitech gadgets).