So...LFD....RAF...Heirlooms...Have you done it?

[Khatovar]

Boosting - taking a high level toon and grouping it with low-level toons. Using the high level toon to kill, thus "boosting" the amount of xp a group can gain in a short amount of time as a high level toon can kill many more mobs a lot faster than a full group of same-level toons. People usually boost in dungeons as elites are higher XP, there's no competition and mobs are pretty close together for easy gathering, but there are some outdoor spots people use as well.

It's pretty boring work.

[Andreauk]

ATM i'm on Raf with heirlooms.. it's awesome!

[luxlunae]

Also keep in mind that if you are doing a caster team, you should be able to get enough cloth doing dungeons at level to keep one toon's tailoring up (the tank works best because of northrend scavenging), and that will help you fill in spots where you don't have heirlooms and keep them at somewhat level. I know that both the outland crafted levelling gear and the low level northrend tailor gear is generally a really good replacement for whatever dreck you've been dragging along through dungeons. I wouldn't suggest trying to level JC, but you can generally pick up JC levelling rings pretty cheap on the AH.