According to MacWorld UK, the Copyright Office of the US Library of Congress has rejected a petition which requested that owners of iPods and other portable media players be allowed to rip the CDs and DVDs they own to their own playback devices. You'd imagine, wouldn't you, that you should be allowed to transfer material you own so long as you make sure that multiple copies would never be played simultaneously. But no. The RIAA strenuously disagrees. Apparently space-shifting and format-shifting do not count as non-infringing uses.
You can read the Electronic Freedom Foundation's reply to the ruling here.