On the subject of movies, I'm watching Alvin And The Chipmunks right now. Makes me want to relive that era of chipmunk-voiced music...
And there's an Alvin "threequel" coming out this summer.
I remember editing music to have chipmunk voices through programs such as WavePad and Audacity. I even heard a lot of popular songs given the chipmunk treatment on YouTube.
Another thing I liked was those Chipmunk-themed groups on DeviantArt.