io9 recently did a seven-part look at the Foundation
series, which was far more interesting and far more insightful than I was expecting. They have a wide-ranging conversation about the series and Asimov, and I was quite fascinated by it.
Foundation and Empire
Foundation and Earth
Prelude to Foundation
Forward the Foundation
I'd like to think that Asimov is a better writer than Australis
suggests above. I think it's the first io9 article that discusses Asimov's prose style, and it pointed out some things that I hadn't noticed. In college I noticed that there's a certain Hemingway-esque-ness to Asimov's prose; it's not just the emphasis on conversation, it's the use of active verbs to drive the story forward.