Most folk I know seem to be using Spotify. If you're one of them then here's a mix I've put together. It features, among others, The National, The Shins, Frightened Rabbit and Bishop Allen as well some comedy.
If you've not got it then you can download Spotify for nowt and use it complete with annoyingly chatty adverts. (I've found that I can't open Spotify links in Firefox, but they open fine in Internet Explorer.)