SHERPA brings you information on new publishing models with broad information on new-style copyright agreements, plus general information about Open Access (OA) publishing. Start with the section Guidance for Authors:
What is Open Access
Journals' Copyright Policies
Open Access News
Advocacy materials to promote repositories & general resources, reports, and more
Resources and Projects world-wide
Directory of Open Access Journals (DOAJ), the list of free, full text, scientific & scholarly journals. Searchable by journals, articles, subjects. Includes 9,707 journals, a 25% increase in the last 2 years. Now includes 133 countries, and has increased articles by 60% in 1 year, offering 11,614,528 articles. (May 2014)
Publishers' Copyright Agreements, including the categories of publishers and their conditions (Green publishers allow archiving of both pre-prints & post-prints).