Blackmask? It used to me a wonderful web site for free eBooks. Got closed down about a year ago because its owner rather foolishly (IMHO) ignored a legal warning that he was violating copyright by making available on his site the "Doc Savage" books. The copyright holders of the books took him to court and got the whole site shut down. Excellent news that it's back again.
Dr Drib - are you sure it's back? The URL
http://www.blackmask.com takes one to a site called "Munseys" - is this really Blackmask???