Last.fm is another site along the lines of Spotify, Pandora, and all those other sites. You create a profile, and can set up Spotify and iTunes to scrobble plays on Last.fm, which basically keeps track of your song plays from each source and compiles them. What it's great for is recommending similar artists, and you can view other people's profiles to see what they've been listening to. There's also a small Hubski group.
last.fm and spottily are both great, and I would be glad to get recommendations on music from you digitally. That is AWESOME... however, this is about sending an artifact to someone. Something physical that you put time and effort in to crafting both sonically and to an extent, visually too. I'm literally pulling out an old mac book so I can use the CD drive to burn this. Let me know if you can do something similarly and I'll add your name.