Nodraw was started a few years ago, and in those years a lot of the contributors finished college, got jobs (in games or otherwise), and most possibly simply lost interest. Of course, there's quite a lot of things that could be covered on the site, so getting in touch with whoever ran the site (nineaxis?) might yield some results.
I felt like I ran out of things to talk about. It was intended for more high-brow source discussion.
Everyone either stopped using source or started doing other things.
It became plagued with attacks.
A bunch of things.