Stevens, J., delivered the opinion of the Court in part, in which Scalia, Souter, Thomas, and Ginsburg, JJ., joined. Breyer, J., delivered the opinion of the Court in part, in which Rehnquist, C. J., and O’Connor, Kennedy, and Ginsburg, JJ., joined. Stevens, J., filed an opinion dissenting in part, in which Souter, J., joined, and in which Scalia, J., joined except for Part III and footnote 17. Scalia, J., and Thomas, J., filed opinions dissenting in part. Breyer, J., filed an opinion dissenting in part, in which Rehnquist, C. J., and O’Connor and Kennedy, JJ., joined.
Once you get past the above, try getting through the massive opinion. Maybe just wait a few weeks for someone more knowledgable to pick it apart for you. (As for me, I'm looking for subtitles)
UNITED STATES V. BOOKER (04-104)
Later