I just finished reading The Ladies of Grace Adieu. I thought it was very good (I liked Jonathan Strange and Mr. Norell a lot, too). It has one story that includes Jonathan Strange, the rest are all stories told in the same setting but unrelated to the novel. There are some interesting takes on how magicians of various types deal with Faeries, and their magic. There's one story, Mr Simonelli the Fairy Widower, which I saw as a little bit of an homage to HP Lovecraft, which made me smile.
All in all, these books are very clever, once you can appreciate the tounge-in-cheek 19th-century writing style. All literary magic needs to have some kind of limiting factor, or else you have characters that can literally do anything, and there's no conflict. Susanna Clarke's magicians are limited mainly by their stiff and nebbishy personalities, and personal hang-ups, and that really amuses me.
