Ostensibly for attendees of an NYCC panel, this free download of the first LOTF audiobook actually works by simply registering on the site. Be warned, it does give you some extra software to download your selection for you. (I use iTunes and an iPod, and so far it’s painless enough, but this means there’s probably some sort of DRM involved.) If you’re into audiobooks, you might be happy to know that Audible carries plenty of Star Wars books (the LOTF books, at least, and several older selections missing from iTunes.)
Thanks to TJHighlandNewark2007 on the TFN boards (warning: link goes to the Exile spoiler thread) for pointing this out.