There really is no secret to how you can level from level 1 to 80 in the fastest amount of time.  I think pretty much everyone will agree at this point that questing is the only way to go.  What that means to you and me is a lot of searching for where to start a quest and where to turn a quest in at.  Well, at least that is what it used to mean.  I recently bought a sweet Alliance Leveling Guide that tells me exactly where to pick my quests up and where to turn them in at.  This has proven to be invaluable in speeding up the amount of time it takes me to get to level 80.