Noesis is a "limited area search engine for open access, academic philosophy on the Internet." It is a dynamic project, constantly being refined, that searches for freely available, high-quality philosophy information.
PhilPapers.org is a directory and search engine for online philosophy articles and books by academic philosophers. The developers at Australian National University monitor journals in many areas of philosophy, as well as archives and personal pages. They also accept articles directly from users. Access to most content is free, but some journal articles may require a subscription (for which MSU users should be automatically authenticated if the Library subscribes to the journal).
PhilSci Archive is a repository of free articles and information on the Philosophy of Science. It contains over 1600 "preprint" articles with a goal to "promote communication in the field by the rapid dissemination of new work."
Project Vox: Giving voice to Early Modern Women philosophers; features images, texts, sample syllabi for teaching and research
Blogs on philosophy may or may not be good sources of philosophical research, but they are a good place to stay current on a philosophical topic, exchange ideas, or keep a pulse on issues in the profession. Here are a couple places to browse or search philosophy blogs: