BBC - Zep cleared of plagiarism. No, Led Zeppelin didn't steal "Stairway to Heaven". Rather, as it turns out, Randy California stole "Taurus":
During the trial, defence lawyers argued the chord progression in question was very common and had been in use for more than 300 years.You can't fucking claim that you deserve someone else's royalties when you've nicked the chord progression in question from Henry Purcell and Alessandro Scarlatti. Well... maybe you still can if you're Randy's widow and you never gave a shit about the music, you're just looking for money.
And in case you want more commentary than this, I'll pass you on to an angry dwarf with a music blog:
Bob Lefsetz - Led Zeppelin ramble ramble internet ramble ramble Kanye.