The Monster Manual contains information on enemy groups, tactics, descriptions, and background as well as including art. It's not ALL statblocks.



I 100% disagree with this. I do feel there is a place for this, but it is not in the Monster Manuals. I do expect them to largely be large statblocks for monsters (the Compendium info has to come from somewhere).
There is a place for this, but it is in the series we have that includes the Draconomicon and Open Grave.
To me, what you list is largely going to go unused. I might use one monster lair in a book, one or two might give me inspiration. The rest are wasted pages. Give me a Book of Lairs, on the other hand, and I might use more (and am more likely to buy it if that's what I need).
I do expect that more than 80% of D&D DMs have internet access. Given the sort of person that tends to play D&D (college students being very heavy in the "play often" category, IME), I wouldn't be surprised if 80% of the games being run have DMs with that level of internet access.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.