There's an extensive feature on Interzone past and present in the latest of Ciaran O’Carroll and Tony Smith's Starship Sofa podcasts.
It's a long and (I think) interesting broadcast: Ciaran and Tony are highly accomplished exponents of daft but insightful blather : they are knowledgeable, enthusiastic and naturally funny commentators. But be warned, in the final segment the bloke they interview about the post-194 era of Interzone sounds a bit like a less articulate version of Kevin Keegan.
Listen at:
http://www.starshipsofa.com/