Via the ASEE's Internation Engineering Education Digest, the Annals of Research on Engineering Education looks to be an interesting place to explore pedagogical issues.
A cool quote from A Day in the Library by Anthony Robins, Janet Rountree and Nathan Rountree:
What are the most important things I learned about doing educational research while doing this project? The old adage is true - a month in the lab can easily save you a day in the library. Or in other words, there is a lot of useful literature out there - read it!