My favourites of the collection are the Disneyland and Aristocats collections. The Disneyland one because I love any chance to listen to park music, and this comes with 3 discs full of great pack music including music from Disneyland Park and Disney California Adventure Park. I also really love the Aristocats collection as it has so much great music including one of my favourites "Everybody Wants To Be a Cat", as well as some really fun "Lost Chords" and Bonus Tracks.
You can purchase the albums separately, or as a collection with the box, but it looks like the Disney Music Emporium web site is currently down with the following note; "We are working to enhance your experience and will be back soon with our full product line."
I look forward to seeing what new music they have in store in the near future!