A couple links to critical material on Norrell & Strange:
Cynn Corvus, a series of personal essays on the book, essentially an enthusiastic and literate reader’s reflections, basically an internal monologue, on the book. Includes an essay on Clarke’s short stories as well, which I skipped in order to permit me to read them fresh when I pick up the book.
Corvus fails to tease out the intended etymology of d’Uskglass but effectively disembowels the stated heritage of the name.
Crooked Timber’s online “seminar,” conducted with the participation of Ms. Clarke in late November 2005.