Check inside for a downloadable torrent of Mountain Lion DP3.
Keep in mind this is called a developer preview for a reason and is not meant to be used as your main OS. So for the curious and those who just have to see what Apple has in the works for the next major release of OS X we have a link to a torrent for the .dmg of OS X 10.8 Mountain Lion DP3.
Please do not install this over your current OS as you will not be able to downgrade. It’s best to install this to a separate partition or drive.