A few days ago I came to WordPress.org forums to get information about the best "series" plugin. After reading a lots of threads, I decided for "Organize Series". The best argument for my decisión was this:
I'll almost certainly use 'Organize Series' because of the huge amount of helpful documentation on the authors site.
So, following that recommendation, I went for the abovementioned plugin. I get an unpleasant surprise, however, at the very moment that visited the author's page and found that the "helpful documentation" was available only for a not precisely cheap fee. I, of course, uninstalled and eliminate the plugin for my wordpress installation.
Thanks a lot for your answers...