For the '05-'08 MDXs (white disc) version info:
v4.6X (old):
-Database: 4.62A (03/17/07)
-Software: 1.64.00
v4.73A (new):
-Database: 4.73A (I think 05/10/08)
-Software: 1.82.01
Alpine has changed the database version from the date the map data was finalized (as it was on earlier versions) to just the update version. However, by looking at the contents of the disc, I believe the map data was finalized on 05/10/08.
The software update is obviously very minor, if any. I didn't see any differences, and it might just be an incremental version because it is a new disc.
Changes from version 4.62X to 4.73A:
Arizona
-Yuma
California
-Central Valley - including Fresno, Merced, Modesto and Stockton
-Humboldt
-Mammoth Lakes
Florida
-Panama City
Hawaii (all cities for the following islands)
-Hawaii
-Honolulu
-Kauai
-Lanai
-Maui
-Molokai
Illinois
-Carbondale
-Galesburg
-Urbana-Danville
Indiana
-Bloomington
-Muncie
Iowa
-Waterloo-Cedar Falls
Mississippi
-Memphis
-Tupelo
Montana
-Missoula
New Hampshire
-Lebanon
New Mexico
-Las Cruces
Ohio
-Lima
-Springfield
Pennsylvania
-Southwest Pennsylvania – including Pittsburgh and Washington County
Texas
-Amarillo
-Beaumont
-Nacogdoches-Lufkin
-Texarkana
-Wichita Falls
Utah
-St. George
Vermount
-Rutland
Virginia
-Emporia
-Staunton - Waynesboro - Harrisonburg
Wisconsin
-Eau Claire
-La Crosse
Canada Detailed Coverage Areas
NOTE: The blue colored city names are not included in the USA South DVD. To obtain coverage for cities listed in blue, you may purchase the Canada DVD. DVDs are not available at your dealer.
ALBERTA
-Beaumont
-Calmar
-Devon
-Fort Saskatchewan
-Leduc
-Spruce Grove
-St Albert
-Stony Plain
-Strathcona County
Squamish-Lillooet
-Squamish
-Whistler
Thompson Nicola
-Kamloops
Central Okanagan
-Kelowna
-Peachland
Okanagan - Similkameen
-Penticton
-Summerland
Frontenanc
-Frontenac Islands
Gatineau
-Gatineau
Muskoka
-Bracebridge
-Georgian Bay
-Gravenhurst
-Huntsville
-Lake of Bays
-Muskoka Lakes
Middesex
-London
Ottawa
-Ottawa
Perth
-Stratford
Simcoe
-Adjala-Tosorontio
-Barrie
-Clearview
-Collingwood
-Essa
-Innisfil
-Midland
-New Tecumseth
-Orillia
-Oro-Medonte
-Penetanguishene
-Ramara
-Severn
-Springwater
-Tay
-Tiny
-Wasaga Beach
Quebec
Montreal-Laurentians
La Riviere-du-Nord
-Prévost
-St-Colomban
-St-Hippolyte
-St-Jérôme
-Ste-Sophie
Les Laurentides
-Amherst
-Arundel
-Barkmere
-Brébeuf
-Huberdeau
-La Conception
-La Minerve
-Labelle
-Lac-Supérieur
-Lantier
-Mont-Tremblant
-Montcalm
-St-Faustin – Lac-Carré
-Ste-Agathe-des-Monts
-Ste-Lucie-des-Laurentides
-Val-David
-Val-des-Lacs
-Val-Morin
Les Pays-d’en-Haut
-Lac-des-Seize-Îles
-Morin-Heights
-Piedmont
-St-Adolphe-d’Howard
-St-Sauveur
-Ste-Adele
-Ste-Anne-des-Lacs
-Ste-Marguerite-Estérel
-Wentworth-Nord
Mirabel
-Mirabel
Quebec
La Cote-de-Beaupre
-Beaupre
-Boischatel
-Chateau-Richer
-L’Ange-Gardien
-St-Ferreol-les-Neiges
-St-Joachim
-St-Louis-de-Gonzague-du-Cap-Tourmente
-Ste-Anne-de-Beaupre
La Jacques-Cartier
-Fossambault-sur-le-Lac
-Lac-Beauport
-Lac-Delage
-Lac-St-Joseph
-Ste-Brigitte-de-Laval
-Ste-Catherine-de-la-Jacques-Cartier
-Shannon
L’Ile-D’Orleans
-St-Francois
-St-Jean
-St-Laurent-de-L’Ile-d’Oreleans
-St-Pierre-de-L’Ile-d’Orleans
-Ste-Famille
-Ste-Petronille
Levis
-Levis
Quebec
-Québec