UPDATE
MineCore has not reached it's end. It is up again. The download was deleted. Have fun again! The server will stay up again. (This means you can ignore the next paragraph about the server ending :P)
MineCore has reached it's end. The server will not be up. The reason for this is not going to be specified in the post. The owner is moving to MineLife (Imagine Nation server). However, if you still wish to continue using the MineCore world (for your server or single player), you may download it and/or all server files at http://my.rapidshare.com/Minecraft1415926/6202
