This could be a bit costly but you should level pretty quick.
Respect: http://www.wowhead.com/?talent=Rf0EbZZi0z
This will give you Magic Attunement, the key factor in elemental grinding. This will also allow for some mana regeneration thanks to Magic Absorption - with 30 elementals attacking you, you are bound to resist several hits per second. For each resisted hit, you gain 5% of your mana back. Arcane Concentration was also used in order to cut down on mana loss and pervents you from going out of mana (OOM).
Grind the water elementals in Stranglethorn Vale.
They are level 37/38, and can be grinded effectively until level 45.
Location: http://img470.imageshack.us/img470/1706/stvgi9.png
OR
Grind the water elementals in Arathi Highlands.
They are level 38/39 and can be grinded effectively until level 46.
Location: http://img112.imageshack.us/img112/1112/arathipi6.png
*Remember: Always keep Mage Armor and Dampen Magic up.
Respec - http://www.wowhead.com/?talent=Rf0VZZVhMusfzh
Using Blizzard, grind the oozes in The Hinterlands until level 55.
Respec - http://www.wowhead.com/?talent=Rf0Eb0bZZVVG0obth
Grind the air elementals in northwestern Silithus.
They drop Essence of Air which sells for anywhere between 10-20g each. This will take you to level 60.
Location: http://img77.imageshack.us/img77/5306/silithustk1.png
Respec to whatever you want.
*Remember: "of the Eagle" gear is best for this leveling strategy.