First song, I heard was Lotus Flower. Immediately loved it, when I saw Thom Yorke dancing :D
But my favorite from the whole album has gotta be Give up the Ghost and Separator.
Give up the Ghost. Listen to this song at night time. For the first time, I literally got transported to another world. I felt like I was in a dark world, a dark forest during night time, besides a river, and after every few strums of the guitar, I could feel the little ripples of water. And I could even feel leaves falling over my shoulder.
Separator. The lyrics goes like this, It's like I'm falling out of bed. From a long, weary dream. But when listening to the song, you actually feel like you're in a dream. I felt like I'm drifting somewhere in space.