This site combines some great factual information about the issues (and explains how they went about validating their sources), Dehlin’s research about why people leave the church, and includes some awesome insight into how an otherwise intelligent and thoughtful person could believe in the church’s teachings. I love that they include a psychological perspective.
The only issue I have with this site is that it’s obviously Christian leaning. If someone decides that Christianity is where it’s at after Mormonism, then good for them. But the explanations of who Christ was and what he taught displayed essentially as “fact” in their presentation that also includes admonitions to “question everything” and “seek out truth” doesn’t convince me that they applied that exercise to Christianity and the Bible. Take out the Christ comparisons (or show the evidence for and against that path), and it makes for a good site.