Today is a big one. Free on-demand listening has come to Last.fm.

Read our official announcement for more details, and enjoy the music! (You may need to adjust your playback settings to play previews in-page.)

Love from London,
Team Last.fm

http://blog.last.fm/2008/01/23/free-the-music

this sounds really, really good, especially for smaller artists.
also, perhaps the final nail in the coffin of myspace? if last.fm offers as much streamable, free music as they're proposing, isn't it likely that very few people will visit myspace music anymore?