Completed the code in yCoordHelper for choosing a point to drop the player when using a Transdimensional Trapdoor. Made changes to DDTeleporter so that the player can be dropped at the specific point we want. This needs further testing, though, since I'm not completely sure it's working right.
DimDoors
Dimensional Doors for Minecraft Adds several items that allow the player to move between and create dimensions
see the MC forum topic for details