Mapwow.com

Mapwow is a very, very useful tool. Basically, it's like Google Earth, but for World of Warcraft! Even better, you can set it to show the spawn points of any environmental nodes, like herbs, mining nodes, or treasure chests!

With the ability to zoom out, you can find which zones have inherently more of whatever item(s) you are looking for. If you're a rogue, I suggest you begin farming treasure chests in Outlands as soon as you have the ability. You can gather lots of blues or epics with some persistence and luck (or, lacking luck, just lots of persistence). Or if you're a blacksmith, make some keys and go to it! I do recommend that if you're going to go farming for things like this, have at least your epic ground mount. Of course, a flying mount makes everything in Outlands even easier, ESPECIALLY when you can bypass all the mobs and get to where you want to go without hassle!

Alternatively, look up the Cartographer addon in Google, and you will find that it can be set up to modify your maps ingame to show these same spawn points. I have more info about that particular functionality in my post about Cartographer databases!