I'm using a few printed modules to work my group into EtRoG by having them travel to Greyhawk from a neighboring area (coming by way of Dyvers area). I ran my group through Paizo's Hollow's Last Hope and Crown of the Kobold King and set it in the area just west of the Gnarley Forest southeast of Dyvers. I'm currently running them through Goodman Games' *The Transmuter's Last Touch after defending a caravan from a raid by kobolds as they were on the road to the city. By the time they reach the point where I can begin EtRoG, they should be right at the level they need to be.
*I met Jeff Lasala at Gen Con while doing a signing in the Goodman Games booth and was very impressed with both him and this adventure. Having him go through it and point at all the cool bits and pieces about it sold me on it. I grabbed it up and decided I would find some way of running it for my home game.