It's legal to back up CD's...

[Easy Mac]

As long as you don't, so says the latest from the RIAA.

http://www.eff.org/deeplinks/archives/004409.php

Quote from their latest case:
Nor does the fact that permission to make a copy in particular circumstances is often or even routinely granted, necessarily establish that the copying is a fair use when the copyright owner withholds that authorization. In this regard, the statement attributed to counsel for copyright owners in the MGM v. Grokster case is simply a statement about authorization, not about fair use.

Quote from the MGM case by the RIAA lawyer:
The record companies, my clients, have said, for some time now, and it's been on their website for some time now, that it's perfectly lawful to take a CD that you've purchased, upload it onto your computer, put it onto your iPod.

So do as we say, not as we... say.