Bit old, but a decent article on what David Foster Wallace is up to. The non-fiction book referred to in the story is this book about Georg Cantor, which I mentionedwhile back. For the dfw completist, there's also this essay comparing the published version of Infinite Jest to the inital draft.
Always good to see what DFW is up to. Nice site here, Bill. We're neighbours--of sorts. Come visit my site sometime.