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http://us.battle.net/wow/en/forum/topic ... 7?page=1#1
here's the Ctrl-c/v of it all.
This is for ALL of the Hunter's out there in WoW.
Let's make a collective list of all the "Beasts" that we want to be able to tame. All of those creatures in-game labeled as "Beasts" that even as a Beast Master "Cannot be tamed".
Any creature you saw and thought "I want one of those"... /cast tame beast... and disappointment.
If there is enough people who want to see these Beasts become tame-able then maybe someone at Blizzard (Muffinus!) might take the time to make it happen (or at least I hope so).
Plus there is huge benefit to having diversity when it comes to hunter pets, when you can choose a few of many different various models and colors there is less of a chance your going to see another player with the exact same team of pets as you, which makes you (the player) feel unique and special. Even though right now there is a diverse variety of pets to choose from somehow everyone seems to have very similar pet out all the time. A sporebat, hyena, wolf, Loque'nahak, Ban'thalos and Chromaggnus (that's pretty much all I see all day long).
I have heard many people on the wow forums and here on petopia forums say that they'd love to tame the dinosaurs in Un'Goro the "Pterrorwings & Dimetrodons". Devilsaurs are already tame-able so I don't see why other dinosaurs couldn't be as well. There is already the "Tome of Dinomancy" that allows players to tame certain dinos. I don't see why Pterrorwing's from the Isle of Thunder aren't tame-able considering if you use the talent "Dire Beast" there is a chance one will be summoned to fight for you.

There's also a lot of love going around for "Stags", wouldn't a night elf with a stag look nice together <3!
The same could be said for Talbulk's as well as Yak's (which the Yaungol seem to have tamed).
Kunchongs, the big amber beasts of the Dread Wastes just look amazing and I tried to tame one the first time I saw one and noticed it was a "Beast". They are technically labeled as Mantid lore wise but have very "Silithid" qualities (like Buru the Gorger from AQ) and I'm sure some compromise to what family they fit in could be made without causing too much trouble. The same could be said for the Sandreavers in Tanaris like Sarinexx.

People have also ogled at the Clefthoof and Mushan hoping to one day have one at their side in battle.
Both the Jormungar Tunneler found in Dragonblight and the Mutated Grub from Naxxramas share the same models as the (tame-able) Amber Parasites in Dread Wastes, but have different color and are not tame-able (but are still apart of the worm family).
And lets not forget one of my favorite creatures of all time the "Gyreworm" found in Deepholm. Most of them are actually apart of the Elemental family but I think a few are labeled as beasts if you search hard enough. Seeing how they even have the word "worm" in there name I would easily see how they could fit into a tame-able worm family.

Now sea-creatures, there are logical problem's regarding taking them on land. I don't doubt It would be fun to run around with a shark by your side, but just like how you cant breath underwater in-game (without special ability's) it just doesn't make sense to keep a fish out of water (no pun intended). Not to say I don't think a logical solution could be made to address that issue, it is just less likely to happen sooner than other creatures becoming tame-able.
Lastly there are a few non-beast creatures in the world with very striking resemblance to actual beasts that would be nice to see made tame-able at some point in the future, such as the Hound of Culuthas found in Netherstorm who looks very similar to Chromaggnus and a few others in the core-hound family.

If you can think of any that I missed please feel free to add yours in the comments!