Correct me if I'm wrong but spectator mode makes you completely transparent, rather than slightly visible/translucent, being translucent would make a better affect for astral projection in my opinion.
Spectator mode does make the player completely invisible, which is unfortunate but it also gives the player the no-clip ability that we see in the show. I'm not really sure if it would be possible to make the player that is projecting only slightly transparent using the "team" things. @
MistPhizzle would you mind testing that out whenever it's possible with Bukkit?
I like the idea, but using AstralProjection for finding resources or underground dungeons and such is actually one of the main uses of the ability, I'd think.
This is the reason I wouldn't want people to be able to Astral Project into dungeons and stuff. It really would not be fair to other people on SMP. Every server I have ever been on has banned the use of things like x-ray for a reason, so I doubt many server owners would want airbenders to be able to go down into the ground and search for diamonds/loot. Maybe to appease people have a config option for the Y coordinate that players are allowed to go down to?
If someone used Astral Projection below seafloor level would that mean that they would automatically get kicked out of Astral Projection?
That, or prevented from going any further.