Blackmask seems to be back. The URL is the same, but the name and layout are different (for some reason the site seems to be called "Munseys"). The books offered are the same (minus the Docs and Shadows, no doubt) and they are still offered in multiple formats, including html, eBookwise, Plucker, Rocket eBook, Isilo, Adobe, Sony Reader, Mobipocket and MS Lit. If you have trouble reaching them at
http://www.blackmask.com you can try
http://www.munseys.com intead.