Nice module. I've installed it on my site, but and set up a test discount, but it doesn't seem to be applying to orders. I'll keep playing with it, as it's probably something I've done.
It would be really useful if you could set up discounts based on taxonomy terms, which doesn't seem to be possible at the moment. I would would like to discount all products from a particular manufacturer.
Thanks for this, hopefully I can make it do what I want.