Yeh, I have to agree with Jacob and Nightscape in saying that Rite of Spring is not atonal. Sure, it doesn't use traditional harmony, but for the most part, all of the chords have a tonal center (or two, as there's a lot of bimodal stuff going on, and maybe even more). It's true that Stravinsky eventually did some serial stuff later in his career, Rite of Spring certainly wasn't one of them

(being his 3rd or 4th major composition I believe - after Fireworks, the Firebird, Petrushka, and maybe something else).
Like Jacob, the rhymthic rush is mostly what intrigues me about this piece. At parts, you the rhythms even sound like those from contemporary music (ie, those timpani 5ths or whatnot, from I forgot which section). But no matter how you classify it, it's an enjoyable piece

.