Enghdal wrote two of my favorite SF juveniles, "Enchantress From The Stars" and "The Far Side of Evil." Evil in particular is a superb book (and would make a cheap and really good SF movie ...)
Engdahl has a new book coming out for the first time in 28 years.
The website comes off pretty didactic, but I'm going to buy the book anyway -- I used to tolerate Heinlein's preaching pretty well, because at least early on he wrapped it inside first rate stories. If you're not already an Engdahl fan, this may not be the place to start, but if you are, now you know it's out there.
I got asked by a couple people to do a second draft of the "Infinite Methods" post. I'm not going to do this often -- revising blog entries is way more energy than I'm putting into this -- but given the subject matter of the Infinite Methods post, what it looks like boiled down is a fair request. Probably be up this weekend.