I'm pretty certain there are no books on iThreads--unless someone has just, or is just about to, release one.

As for ithreads and 5.6.anything, I think it would be a pretty short book that simply said "Don't". That holds pretty true for anything prior to 5.8.4.

I'm slowly building up a library of techniques for using iThreads, for my own use. I have had a crack at almost every suitable problem that crops up here and a couple of other places, and find most of them reasonably easy to program.

The biggest problems are a lack of people using them, and a lack of good problem descriptions. The former might be alleviated by the availability of a book, but until there is a reasonably comprehensive set of problems that have been tackled and used in real-world scenarios, writing such a book would be mostly hot-air and supposition.

Not that the latter has stopped many others from writing books in the past:) And I suppose you could always get it right in the second re-print.

It would be nice to get some conversation time with one of the 2 or 3 guys that really understands the internals of iThreads and get some answers to some of the more esoteric questions, but none of them seems to daly hereabouts.