Comment by thinkpad20

Seconded! I've been working my way through both of those for a while. For those who like watching lectures (as I do), I would also recommend Pierce's lectures on the same material as Software Foundations, Harper's lectures on type theory, and the other associated lecture serieses, all coming from a session of the Oregon Programming Languages Summer School, and available on youtube. Unfortunately there are some gaps in the software foundations lectures, but considering that it's a complement to an already detailed set of literature, it's not a major issue. Also unfortunately, the quality of the audio and video aren't always the greatest. But, beggars can't be choosers! It's still great material.