Server owners don't want to go vanilla so they wait for craftbukkit to come out on 1.4. Then they wait for the essential plugins and thats when they update
xray isnt really a mod,its a texture pack added to minecraft that makes all the blocks to 0%,for clearier,it just hide all the blocks only:-
Obsidian
Lava
Water
Standard ores(coal,diamond,butter(GOLD),soap(IRON) and redstone)
Jungle stuff(a.k.a logs,leaves and the jungle ladder)
Wood(wooden planks & wood)
Usable items(chest,crafting table,Furnace,iron/wood door,button/lever,trapdoor etc.)
High-Value stuff(iron,gold,emerald and diamond blocks)
but there a X-ray plugin that makes u unable to watch ores,that replaces the stone to Ores and tnt's,for the video click the spoil down here,yes here V.
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http://gamerzelite.de/showthread.php?mode=threaded&tid=1849&pid=14762#pi d14762
OR