I like to sign up for the racord companies mailing list. They periodically send email magpabago about what they're doing, who they're working with, and what they're working on. You find about certain projects before they're released.
I also subscribe to my paborito artists VEVO account on Youtube. Thet way, you can see their music bidyo as soon as they come out.
Or you can sign up with the various online playlist/radio websites. *Last FM *Jango *Pandora There are many. When signing up, they'll usually ask you if you would like to recieve their newsletter. If you accept them, they'll notify you about new music.