Half the book, granted, is outdated lists (of the constantly changing contact info and deadlines for all of the conferences and workshops, which are easily accessible via the internet now, anyway).
But the other half of the book alone is still worth the purchase price. I wish someone would do an updated version of it.
I read this book several years ago when I started SOC (Screenwriters On-Line Cooperative) and it was instrumental in helping me define our culture, goals, and structure (i.e.: what to look for in a writers' group, what to expect, how to form one, how to GROW one, etc.).
I still recommend that all new members read it, so we're all on the same page as to how to benefit from - and contribute to - a good writers' group.
I also use it as a reference in my screenwriting classes to help students offer constructive criticism to one another - and how to best incorporate the myriad suggestions and insights they receive themselves.
I have loaned it out several times - and now must buy yet another copy!