Desura rings a bell. Unfortunately I can't find that link I mentioned earlier anywhere - ludum dare is so lively I looked through a few dozen pages and had to face the reality its lost in the tsunami of content those guys generate XD

Although it would pose the same issue as Desura, you could go to the Ubuntu Software Centre - you can get paid, theres a lot of users out there and its looking for developpers to submit apps to it. Oh, and its not only limited to ubuntu since its now possible to get it up and running on many 'ubuntu-like' distros