They do still sell all of their books - just not directly on their website.

Whenever possible, they're sold without DRM.

Which is fine but they ruined their direct DRM-free sales. You used to get access to a PDF, epub, and mobi version of a book with no DRM. They even conveniently allowed you to sync your purchases to Dropbox. It was awesome.

Now you have to hope something g you're interested in ends up in a Humble Bundle or something. The situation is worse in every way for a end users.