Good thread. I've noticed in past libcom discussions, a couple people saying that anarchism (at least in its communist form) cannot have an economic system, because economics is about managing scarce resources and communism is the abolition of scarcity. Therefore, if coming from an anarcho-communist perspective, we should never speak of anarchist economics.
To me it seems like a bad idea. It's already hard enough to communicate anarchist views to people who don't yet agree. If someone is curious about anarchist economics and we have to say "Actually there will be no economics" we just will confuse them, and we make anarchism seem unrealistic.
Also, I don't even know if I agree with the premise. Scarce resources is just a fact of life, communism or not.
This is from SPGB/WSM type perspective but I actually think these folks have really put good work and time into trying to think things through in some cases more than contemporary anarchists have:
http://mailstrom.blogspot.com/2012/02/socialist-blueprint-part-1.html
http://mailstrom.blogspot.com/2012/02/socialist-blueprint-part-2.html