Ponycraft, a Minecraft server dedicated to recreating Equestria, has been booming in progress. The server, created a mere month ago, already has many of Equestria's mane towns and areas almost completed. If you've got Minecraft, I definitely suggest stopping by on this server at some point, it's pretty amazing.
Cloudsdale, my favorite place so far
Fluttershy, the creator of Ponycraft, has recently released a seven minute long video showing what the server currently has done, it's actually pretty amazing. Keep in mind that most of this is actually incomplete, and quite a few places are still in the early planning stages, like Canterlot.
Amazing, isn't it?