Inverted Entertainment has an interview in which Mike discusses his days at MST3K and his work afterwards. You can read it by visiting http://www.invertedentertainment.com/main.php and clicking on the “interviews” link.
The Journal of the Lincoln Heights Literary Society pretty much skips MST3K and instead talks with Mike about religion, politics and writing in general. You can read the interview at http://liheliso.com/Interviews/MikeNelson030704.html.
Thanks to Dennis Redler and Laurel Sutton for the info!