I've recently discovered the website 52 tapes. A guy supposedly called Jim started compiling mixtapes about a year ago, each featuring a theme, e.g. "Leaving", "This Too Shall Pass" or "Come Again?". His choice of music is all over the place, and really enjoyable. First tape features Bob Dylan, Sleater-Kinney, and Low, amongst others. I'll spend a lot of time listening to his mixtapes, that's for sure.