I have a similar backlog of Steam games. Seasonal sales and Humble Bundles do crazy things to your library. I have a backlog of friends to catch up with. It's been tough since school ended and I've been trying to keep up with people but I've been woefully behind on several of them. There are plenty of albums I'm behind on. For example I recently downloaded all of Aesop Rock because I was interested in his work, but I also want to give it due attention and appreciate the lyrics so I just kinda haven't dug into it and keep listening to things I'm already comfortable with. I'm also behind on the programming projects I want to do. I've had it in my mind to make a simple game but I just haven't gotten around to learning the tools I need. I guess when I program at work all day I'm not as interested in doing it on my own, even though it'd be fun and I'm getting a lot of good practice. I guess this one is more of an "idea" backlog than having anything physical to be behind on.