Abstract: Libraries have a long tradition of promoting knowledge creation and information sharing. In order to reduce cost of education, libraries are playing active roles in building open education resources in recent years. Based on literature, this paper proposes a taxonomy of three layers of Open Education Resources: open textbooks, open learning objects, and open courseware. Open textbooks are being adopted by many faculty and students in the U.S., but they are not evenly distributed in all disciplines. It seems humanities, math, and business are more keen on contributing to open text creation, but fewer on medicine and engineering. Open Educational Resources also include ancillary resources related to course content delivery, such as syllabus, homework, instructional videos, and additional reading in modular format. This paper surveyed existing OER resources in the framework of knowledge creation and information sharing.