Finished JS&MN and Kate Nepveu's Tor commentary on same. This isn't exactly the pleasures of fandom, but something close: a work with scaffolding about it. Though I'm not sure what I mean by scaffolding: something that adds something else to the original structure. It's not just the book I read eight years ago. It's book and discussion of the book, and the BBC series and discussion of the series, and probably a slew of fanfics attendant on that in the course of time. More dimensions than the book, if you see what I mean.
Not that scaffolding is necessary for satisfaction. Ze has none and needs none, but then manga gives you pictures as well as plot. More to the point, Pratchett -- well, does have scaffolding, but doesn't need it. I don't think the movies or TV shows or whatever they are could add to the books; I don't need a visual component; fanfic is nice enough but not a necessity; and discussion... mh well. I have strong feelings about Discworld and no strong feelings about JS&MN; so people's opinions of the former are as likely to upset me as please me. Whereas people can discuss Norrell and Strange and Stephen and Lady Pole quite as much as they like, and none of it touches me.