Although the benefits of blended learning have been well documented in educational research, relatively few studies have examined blended learning in language teacher education. This study discusses a blended learning approach for a teacher training program designed for in-service English language teachers, and investigates its effectiveness by comparing with a face to face MA Program in English Language teaching. The research involved 39 in-service English language teachers, with 12 studying in a blended course (i.e., they received face to face instruction in the classroom and used web-based materials) and 27 in a traditional classroom. Results indicated that there was no difference in content knowledge acquisition between teachers receiving blended instruction and teachers receiving face to face instruction. (Contains 2 tables.)