SecurityDocs.com is a directory of information security articles, white papers, and other documents that information security professionals find useful.
The value of SecurityDocs is that it collects white paper meta data from other popular security sources. This allows InfoSec professionals to browse by category or search for papers based on the category, description, title, rating, and other information specific to that paper. Allowing viewers the ability to rate and comment on papers gives future readers a better expectation of the papers value.
SecurityDocs is completely free and does not require registration before accessing any of the features.
From what I have quickly browsed through, it looks like a pretty good resource! [Dana Epp's ramblings at the Sanctuary]