David Bellos' new book on translation, Is That a Fish in Your Ear?, contains a few pages on Nabokov. You can read them by searching the book at Amazon. The book itself is reviewed here:
http://www.nytimes.com/2011/10/30/books/review/is-that-a-fish-in-your-ear-translation-and-the-meaning-of-everything-by-david-bellos-book-review.html?_r=1&ref=books