Mignolaversity is a part of the Multiversity Comics website focusing on (surprise!) Mignola's stuff. So far it's mainly been reviews, but lately they've started doing interviews with the creators. And they're good interviews too, by people very familiar with Mignola's work.
Here's their first interview with Tonči Zonjić.
And here's their second with James Harren.
Expect more in the future.