I'm enjoying Jonathan Strange and Mr Norrell, although I've had to settle for the fact that it'll probably be the only book I read this month. (I do not remember the last time that happened!) I have some 650 pages left and I started this exactly a month ago today. (So I've read about 370 pages. 
)
Anyway, the dynamic between Strange and Norrell is amusing and I quite relate to Norrell's obsession over his books.
I do wish there was a bit less atmosphere or whatever it is that makes this such a slow read for me. Maybe the man with thistledown hair will cause some mayhem soon.
@asta Tried to read it couple of years ago and then it was a Did-Not-Finish for me. Maybe a retry is needed in a few years 
@PTM Sometimes the timing is just not right! I'd probably leave this unfinished too if I wasn't actually interested in the story.