A lot of people use torrent sites. I am terrible with torrents, in that I am often behind firewalls that don't like them. I prefer sites where I can upload or download larger files in one big download or upload.
Besides this great IORR site, I use and post on [
www.guitars101.com]
It's got many parts to the site, but has a part with lossy bootlegs (MP3) and lossless bootlegs. As with everything, there are dead links, etc, but they have a lot of good quality Beatles' recordings: live, demo and outtake.