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Well, I just threw one more app on the promo. EdgeMates - North American Capitals is free today as well!
Thanks for the thoughts, DemonJim. Interesting--I have a prmac account and have used them in the past. I think I may even have a credit or two...
Looks like my timing is perfect! I just signed up for the forums on the recommendation of another developer, and have already set up my app...