SimplyVanish provides simple commands that let players either vanish or reappear. You will be invisible, invincible and not become target of mobs... neither will you drop items nor pickup any or interact with the world in any other way (almost) ... unless you want to and have permissions to do so. Enough for sneaking up on xrayers with one or another command, making use of the new Bukkit vanish-API introduced back in 1.1-R4. No need for Spout, no hacks, just Bukkit-API !
So far the theory - Experience orbs still pose a slight problem due to missing API on the Bukkit side, so a more or less crude workaround is used for those.
Download (latest upload): SimplyVanish 1.2.0
(This version might need approval.)
You can vanish with /vanish and reappear with /reappear or toggle with /tvanish - there are shortcuts and other uses, see the Commands/Flags section for reference, especially if you want to place blocks, inspect chests, chat, or interact in another way with your vicinity.
Planned additions: Page
Plugins that combine well: