What a cool idea. I hope Tim gets some good questions via email.
Agreed. I'm kind of curious why he didn't allow/enable comments on his post. That seems like the lowest friction way of getting questions, and it would double as a ranking system if he used a commenting system with voting (e.g. Disqus).
Because I've never built comments for this version of my blog ;)
Nice gesture, more positivity and community contribution like this!