Olive said:What support does it give to these four? Especially the BoVD? Also, to what extent does it 'support'? Does it provide rules you 'd need these three to use?
While I think of it, does the MM3 give little break out boxes supporting other products like the FF did?
I really want this book!
Stronghold Builder's Guide
There's a sidebar describing how Blue Ice may be applied to walls in a stronghold; the traps section also applies.

Oriental Adventures
A couple of oriental-themed monsters (like the Yeti

Living Greyhawk Gazetteer
Descriptions of Telchur and Vatun, two of the Greyhawk gods - (they get new domains: Winter for Telchur and Snow for Vatun). Oh, and Dungeon #115 has a Greyhawk adventure using the rules from Frostburn.

Book of Vile Darkness
The City of Icerazer is the headquarters of the cult of Levistus, one of the Archdevils of Hell. (This gets 22 pages). Although you don't need the BoVD to use this, it makes a nice addition.
Deities and Demigods
The Disciple of Thrym PrC (lord of Frost Giants) and the Midgard Dwarf help along the population of an Asgard world.
Monster Manuals
The Encounter Tables list monsters from MM1, MM2, MM3 and FF, and also have substitution monsters if you don't have the tome in question.
I don't have Monster Manual III yet, though it came into Ballarat. Alas, I'm out of money (again).

Cheers!