Thanks to everyone for the positive feedback so far. I've already had some folks give me some editing help and suggestions (cat, NickyDude, Mods, limeTree, and especially Ethan Damschroder who gave me a whole pageful of corrections!). And thank you to everyone who has posted to say that the videos were helpful.
Do you mind if I ask you a few questions about AGS? You seem to really know your stuff.
Sure, ask away. There are lots of folks here on the forums who know AGS much better than me, so someone is bound to be able to help. I would ask that any technical help be put into a separate post or PM, so that this thread doesn't get off-topic :-)
Thanks for ruining (sp?) a what promised to be perfect weekend... 
Hey, no problem. I'm always looking for anything I can do to mitigate would-be productive time. :-P
And bonus points for using drop.io 
Yep, great resource, that.
My only comment would be that the intro ends a little short, it'd be good to see you promote how the scene has developed since the millenium - how companies like Wadjet Eye have changed the scene thanks to AGS, etc. The book reminds me of those Guerilla Film Maker's blueprint books, and they feature case studies with film-makers - I think some case studies with some AGS developers would really make it that much more interesting to read.
I agree about the intro. Not only that, but I feel that the intro paints a picture of AGS that seems dated by the way I've presented it, and that wasn't the intent. That needs to be changed. I like your idea about case studies, and there are plenty of great AGS games that I didn't mention which deserve to be mentioned. There's so much stuff, it's difficult to know where to start and how it should be organized. I don't really want the intro to be huge, but on the other hand I want it to do a good job in describing AGS and the community behind it in a way that gets people excited about writing games.
None the less, very good job, it must have taken a while!
George and I only work on this 1 day per week for a couple of hours, so yeah, it's taken a year to get this far...
If anyone wants to help work on this, please let me know. We're open to volunteers who want to contribute in any way. Maybe I'll put a post up in the Recruit a Team board as well.
THANK YOU everyone who has given feedback! It's very helpful!