The Fortran Open Directory at http://www.dmoz.org/Computers/Programming/Languages/Fortran/ is a comprehensive, annotated list of links for Fortran programmers, with the following categories (# links in parens)
Compilers (22)
FAQs (2)
Information (6)
Libraries (26)
Source Code (400)
Tools (53)
Tutorials (45)
Books (32)
History (8)
Quizzes (5)
Please submit new links through the Open Directory site and consider becoming an editor of a category. I am currently an editor.