I was using my pi as an airplay receiver for my hi-fi. I'm not sure if they fixed it yet but the analog out was pretty bad (8kHz mono at the tome) but I know the audio quality could be better. So I stopped that then played Minecraft, now I use it to SSH into my house and WOL my ESXi servers, get the ipmi data from the servers and some simple Node stuff.
This is the Pi B v1 (256MB) I'm thinking about getting a v2 now.