It's closed to new material, but existing things remain for sale. No problem with DriveThru, but I'm re-evaluating our strategy.
It might reopen at some point. Or, we might replace it with a different approach, depending on what John and Greg are cool with. I would prefer something that is not tied/limited to one platform, and I'm not personally very concerned with getting a cut from peoples' sales, having some experience with what kind of money is involved.
We're going to be watching closely how the Ars Magica open license goes, with its whole "everybody just go to town, no payment cut, no approval, sell it anywhere you want" approach. (And in fact, I just purchased a third party Ars Magica adventure on DriveThru just a few minutes ago...)