I have posted to Secondary Sources a bibliography of interviews with contemporary writers available online. This list complements the previous list of online critical essays already posted to this "scholarly" sideblog.
I have concentrated on substantial interviews that were conducted to be read, leaving out oral and video interviews on the grounds that the latter are more difficult to use as sources for critical discussion, which these lists are intended to help facilitate. This means that prominent interviews such as those to be found on Ed Champion's Bat Segundo are not included, but since those interviews in particular are readily accessible by going to Ed's own site, such an omission seems only moderately serious.
I myself have found well-conducted interviews helpful if limited for gaining further insight into a writer's work--what the writer has to say needs to be heard, but it is by no means the final word in the critical consideration of that work. Unfortunately, most interviews, especially in the popular press, are not well-conducted and amount to no more than chitchat. The webosphere has made more interviews available than ever before, but many of them are also rather superficial. There are important exceptions: Robert Birnbaum and Dave Weigel (of Powells.com) have especially done admirable work in the interview form, and the interviews available at Bomb Magazine are also valuable. Ultimately I have included interviews that range fairly widely over a writer's career or that provide especially provocative comments. I have not included the many brief interviews conducted on the publication of a new book that are essentially just publicity pieces.