Ok, here are the leveling guides:

First is my favorite one, Zygor’s In-Game Leveling Guide.

Although I think Zygor’s guide is the easiest to use, Joana and Brian Kopp’s guides have also been updated and are now also in-game similar Zygor’s guide.

Brian Kopp’s Aliance Leveling Guide: I would recommend this if you play an Alliance character. It has a slightly better 1-60 leveling path IMO than Zygor’s guide. You should take a look at both of their websites though and see which looks best to you because for Alliance both guides are really good.

If you play Horde though I think Zygor’s guide is still easily number one though.

Death Knight Guide: I know that many of you are now playing a Death Knight or are about to make one soon, so I really want to recommend the Killer Guides Death Knight Guide. It has tons of useful information.