Hehe, I figured it was just because I'm new. But there's some nostalgia in the domain name for me. Used to be a 'planet' website for all latest games. PlanetQuake was a regular stop for me back in the day. Most of the disappeared when the domain owner shut down the supporting servers. Seems natural to me now, however, that there should be a PlanetMinecraft. It's perhaps the most modded game since Quake (which still has an active mapping and modding community).