According to open access advocates, there are two primary colors:
Green OA Self-Archiving: Authors self-archive the articles they publish in the 25,000 peer-reviewed journals
Gold OA Publishing: authors publish in one of the c. 3000 OA journals (some still recovering costs through institutional subscriptions, others through author/institutional publication charges) You can find these titles in the Directory of Open Access Journals
- development of more OA (“gold” road) and SPARC-type (lower subscription cost) journals, that over time gain in stature and impact to provide true competition with traditional established titles
- increased implementation of institutional repositories (IRs) and self-archiving, enabled by further development of effective finding tools like OAIster and Google Scholar
- more funders mandating deposit of grant-supported manuscripts in free archives like PubMed Central
Seems like Karen made a good prediction!