Thanks for the recipe, I haven't tried it yet, but it sounds great. When I make it, I think I'll tweak it a bit by adding a few drops of wintergreen oil for a flavor a bit closer to commercial root beer, and also add some maltodextrin to enhance head foam. I also prefer the bubble quality of the champagne yeast, also doesn't taste quite as yeasty to my palette, wouldn't recommend glass bottles if you go that route (boom)
For anyone having a hard time finding ingredients, I've been ordering my herbs from http://www.herbco.com - haven't had any problems with them, prices are good, always get my package within a couple of days, great selection, including sassafras bark.
For anyone worried about sassafras containing safrole, chances are that you already are consuming it, as it is also found in black pepper and basil. Oh snap! I don't worry about it too much, I would imagine that it would take quite a large amount to hurt somebody. I'm sure there are plenty of other things killing us much faster, like pollution and McDonalds.