If I had to choose a handful of albums:

Radiohead - Kid A
AIR - Moon Safari (a fantastic chill album)
The Postal Service - Give Up (a sentimental favorite)
Daft Punk - Alive 2007 (an album to appreciate after going to a live show)
Pink Floyd - Meddle/Wish You Were Here
The Beatles - Rubber Soul

Neutral Milk Hotel's "In The Aeroplane over the Sea" and Built to Spill's "Keep it Like a Secret" are growing on me, but cannot be considered favorites at this point.