Okay, here are the results-to-this-point.
Based on 71 responses, I used these scores -- Yes = 4, Probably Yes = 3, Maybe = 2, Probably Not = 1, No = 0. In the case of nonstandard answers (???, I dunno, etc.), I made as close of a guess as I could, aiming higher (thus an answer of "??" = Maybe = 2).
The results are listed as "raw votes" and standard division average (# of votes divided by 71, the number of respondents).
If someone wants to check my maths, please do so
Expanded Psionics Handbook: 163/2.30
D&D Map Folio I: 52/0.73
Complete Divine: 186/2.62
Eberron Campaign Setting: 118/1.66
Planar Handbook: 135/1.90
Races of Stone: 119/1.68
D&D Map Folio II: 49/0.68
D&D Basic Set: 69/0.97
Monster Manual III: 195/2.75
Frostburn : 112/1.58
Eberron Whispers of the Vampire's Blade: 60/0.85
Special Edition Player's Handbook: 55/0.77
Libris Mortis The Book of Undead: 172/2.43
Shining South: 77/1.08
Complete Arcane: 189/2.66
Sharn : City of Towers: 66/0.93
Races of the Wild: 107/1.51
Map Folio 3-D: 43/0.61
So, what does this show?
The top scores are for the Monster Manual, the Complete Divine & Arcane, Liber Mortis, and the Psionics book. All of these rated 2+; the Planar Manual was pretty close. Overall, the closer the book is to being a "Core" book, the more likely it is to attract general attention.
I think the Basic Set got a low score primarily because this site is for pretty much experienced gamers; I think the sales will be higher than expressed here.
OTOH, man, WotC better do something pretty spiffy if it wants the Special Edition to sell...
All other conclusions, I leave to you
