1. mmo-champion wow forum> in-depth timeless isle hidden chest guide: this is an excellent post which gives you a map and co-ordinates for every treasure chest on the timeless isle. it is primarily a Tomtom macro and Paste guide which are both wow add-ons
2. Wowpedia timeless isle page is a very good site which gives a map and alphabetical list of locations for the timeless isle rares, it also lists some of the treasure chests ( but not moss-covered) hopefully these 2 sites will cut down on the "insert rare name here" WHERE??, CO-ORDS?, WHATS THAT? posts that we are getting in general chat at the moment :D.
ok now for some things I have found out whilst playing.
1.rare respawn times. I am not 100% sure about these times so please don't hunt me down in-game ( or real life please ) and kill me,
A. dread ship vazuvius is 1 hour, summoned using lantern which is looted from "Evermaw" (whale shark) a graveyard will spawn at co-ords 28-27 ( where ship spawns) which will enable you to use lantern.
B. Evermaw is also 1 hour, best place to wait for this is at the Alliance/horde camps follow/kill it with enough people it usually dies near where the Dread ship spawns. apologies in advance but I do not know how to link items into this post ( perhaps someone else can) some useful items to use when chasing evermaw are; Elixir of walking water, can be purchased at auction house if you are unable to make it yourself, it is currently selling for 865% of normal price on my server (Thunderhorn) about 30g for 2. Anglers fishing raft, this can be purchased if you are "revered" with the angler faction ( pandaria dailies) there is a water skimmer mount that you can also obtain, I think you can purchase it from anglers at "exalted " but am not 100% on that. finally , Cursed swabby helmet can be looted from pirate ship underwater near old pi'jiu it is locked so you need to loot key from nearby npcs this allows you 200% increase in swimming speed.
to be continued