Rdio is Now Free on the Web
I can't possibly recommend Rdio enough. The design is simple and intuitive. State transfers nicely between devices.<p>Even little things are pleasantly surprising. If I have my laptop hooked up to speakers at a party playing through Rdio, I can change the song from my phone.<p>The only thing it doesn't have that I'd like is Grooveshark-esque queue building. Every music player could just lift Grooveshark's queueing system wholesale and everyone would be much happier.