All their albums are great and they all fit a certain mood. My favourite album is the white album, just for it's diversity. I also find it to be their most ceative in terms of themes and music.
however, Let it be seems to be most often in my cd changer. I find it to be their most emotional: "two of us", "I've got a feeling", "the long and winding road", "across the universe". You can really feel their blues....despite that "wall of sound".
("don't let me down" should've been in that album)