Available here at informIT.
Andrew Binstock and Donald Knuth converse on the success of open source, the problem with multicore architecture, the disappointing lack of interest in literate programming, the menace of reusable code, and that urban legend about winning a programming contest with a single compilation.
Among other things, he explained why the numbering of Volume 4 fascicles starts at 0 and not 1. (You may recall that there is no Volume 0 and so zero-based counting cannot be exactly the reason. Well, I mean not exactly.)