I love this series of simple video interviews with Rupert Neve from Rupert Neve Designs. Here he discusses creating his first transistor-based mixer.
Matt McGlynn over at the informative Recording Hacks site has a section devoted to Tape Op mic reviews. Not all of them are up yet, and we're not quite sure why he wanted to tackle this project (crazy? smart? nice guy?) but it's up there. Now I can read some of my old reviews and cringe.