Hayden Hawke has just released a new version of her leveling guide, Leveling Secrets. I've gotten a chance to take a look at the guide and I'll tell you a bit about it.
The guide is not your typical leveling addon guide, it's a compilation of information you need to know in order to help you become the fastest leveler possible. While most other leveling guides use in game addons to direct to the next quest or quest route to take, Hayden's guide teaches you the basics that you need to know in order to gain the knowledge necessary to level fast.

So basically, instead of just telling you where to go and when, Hayden's guide provides you with the insight you need to have while leveling so you can make the best decisions for yourself on how to level and where to go. Because of the nature of the guide, it really helps to strengthen your WoW skills. I like this about the guide because you know after reading it that you have become a better player, it's far more valuable in my opinion that just following an arrow that tells you where to go. With this guide you actually learn and grow as a player (as crazy as that might sound!).
The guide itself contains over 500 tips related to leveling and covers everything from making gold while leveling, class specific leveling insight, the best zones to go to at any level, and a lot more.
If you have a chance I highly encourage you to take a look at Leveling Secrets as it can easily save you lots of time and effort while leveling.
