A Summary of Theology and Thought in Messianic Judaism/For More Information
- Torah Resource - Contains a great deal of resources, both free and to buy. Most of it seems to be by Tim Hegg. 
- UNJobs - Articles by a few Messianic authors. 
- Tim Hegg 
- D. Thomas Lancaster 
- David H. Stern 
- To start, I recommend Google Books.