if you throw an ender pearl through into or out of the nether on 15w39b snapshot server you will often transport to the relative coords that the pearl would have landed in that dimension.this essentially allows players to move distance=(initai coords)(8)^x where x is the number of portals you repeated the process. this can be repeated for until you get up to extremely high coords. It has been tested up to 3.5m blocks.

this is only found in multiplayer in my experience with it.