but the nether is also used for fast traval, in the images above, where each gate was suppsoed to be made it has a gap between them of 10 blocks, now for every block you traval in the nether you move 8 blocks on earth, so this means the 2nd image you have 160 blocks between the 2 gates on earth, if it repeats like this, it can be much further, not to mention that sometimes the gate can be spawned in a undergound cave with no exit and a mob spawner just near by, you'll end up dying in no time unless you packing lots of food, a diamond sword and trucks loads of arrows and a bow
i've been playing this game for about a month, as of late i've been making a world with has the following
an apocolypic destroyed city that was created for Classic
2 areas generated by ZOMG
another area generated by ZOMG but with a building in the middle
i created a new world, exited and using MCEdit (link found on Minepedia) added the above areas, went back in and the generated areas and the city are much lower than the nornamlly genterated world so where the ruined city is, you'll die trying to fall off the cliff to there so i've build a tunnel from up high going undergound into the bottom of the building with minetracks all the way though it, so far i'm clearing out all the mobs in the building and re doing it's interior becayse ZOMG makes the inside of the building out of clay but i got truck loads of stone (smelted cobblestone) to replace the clay with, also got to figure out where the hell all the dam mobs are spawning from and light those areas up, been lucky a creeper hasn't blown up in there, but once i looked at the entire world in MCEdit and all around my generated stuff there's generated world so it looks like the area as suck into the ground and the ruin city as a gap on 2 of it's sides (where the cliff is) and theres water going down there liek water falls, gives off the feeling that the city is Lei Monde from Vagrant Story
problem with ZOMG is that it creates levels for classic so you need MCEdit to add it into Alpha Worlds and that it doesn't seem to ever generate Redstone so if you want some you can't cheat by generation a huge block of it, you have to mine it in the normal generated worlds yourself