Well I've contacted people from Steam and from Desura. Only Scott Reismanis, from Desura, has returnd my inquries so far. Scott and I had an interesting conversation about the system and what they plan to do, so I thought I would share some of what was disscussed.
Right now they are in a private beta, but he told me if I wanted in he would add me. I don't know if he is adding anyone and everyone, but I believe if you want in you need make a ModDB account and send him a message and ask to get in.
He explained the service in detail. He told me there are no fees to sell a game, but they take a percentage of the sales 30% - Them, 70% - You. The system is an app like Steam, except you control your games site(Store front), content, price. They finished work on their patching system, and they are now working on the finance system (Setting price, Tracking orders). He also talked about an "Optinal C++ SDK" which will allow stat tracking, accolades(Trophies, Achivements), and Authentication(DRM).
From what he was telling me Desura is a Social Gaming network somewhat like Steam. Members can take screenshots ingame and post them up for disscussion. Feedback of games comes straight from the community as do reviews.
If you have a question about anything ask me, he may have told me allredy and I forgot to post it. Once someone from Steam contacts me(If they do) I'll post that here to.