BBC Radio 3's Beethoven Experience, all nine of Beethoven's symphonies performed by the BBC Philharmonic, to be made available as free MP3s after they are broadcast in June. 1 through 5 already available. Go BBC go!

The downloads are quite slow (4.2 KB/sec), so allow a couple of hours to download each symphony. (This is what BitTorrent is for, but I don't see anything on the site that would indicate they'd be OK with someone setting it up. Not that that's ever stopped anybody.)