For Alliance it's Lok'Modan, Redridge, Darkshore, Felwood, Stranglethorn (both parts), Plaguelands. Somewhere between 3 - 3.5 of these get you to 60 in like a 16 hours /played, if you queue for dungeons at the same time. I recommend dropping everything at 45 and going to Darkshore-Felwood if you didn't do them yet - they are literally the fastest levelling zones in the game right now, maybe only trumped by Silverpine.
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“I think that there’s a lot of gray in the game and in our world, right,” asked Cobo. “And so I think that tapping into that and making things reflect the complexities of the relationships that we have between these key characters and then the player itself, and having the player be able to experience that from their perspective, is really what is one of the strong connecting hooks of World of Warcraft.”

TL;DR: Champion equipment is an investment for long term profit. Two different type of equipment, one raises % of success, other gives back materials on mission completed. Best item is 10% per troop, but you need 1 Ofuscation Vial. Magnetic Mining Pick and Disenchanting Rod are the best ones in material returns. You can break even with investment sooner than you think.
A little bit about myself for credibility: I am a 21 year old college student and have been playing WoW since it was first released. I have three characters at the gold cap and want to share my methods with you in a way that I hope has been more clear and concise than the other guides out there. Thanks again and check back soon for my role-playing guide for WoW as well as other guides for MMOs and RPGs in general.
From “The Burning Crusade” expansion, weapons like Klinge der Zauberei, Die Nachtklinge and recipes for different weapons are really valuable. The best example is Pläne: Teufelsstahlangschwert, worth 500.000+ Gold. These items are World Drops, you can find them in all raids and dungeons. I don’t know any Open World Drops, but that does not mean there are none. Another great transmog source are world bosses and rare spawns on Outland.