As far as WordPress/Thesis goes I don't have anything for you. But I can tell you I'm playing around with a landing page in a way that describes what you're hinting at.
To cut to the chase, I have a landing page that has my products name in the URL. It stands on it's own when it comes to the domain name.
But I'm curious too on how each of third party distributors play together; if at all. And I want my best choice as to who I want to sell my products through.
My idea though, and this is what I'm thinking, I think I'm going to run with Amazon based on the name and direct them to an Amazon publisher link. ( I'm curious to know how I can track that with Goggle Analytics as well )
I want to add that I've looked into Clickbank and a few other Ebook outlets, but I feel safe with the fact that someone who wants my product can go through a one click purchase with Amazon. Now that's golden because many of us have an Amazon account nowadays and all the customer has to hit the landing page then the link.
Anyways I'm just shootin the breeze right now because I'd like to know a few solutions, too.