Ask WoW Insider: Best way to power level alts?

It's time once again for our weekly dose of Ask WoW Insider, wherein we publish one reader's question for everyone to answer. This week's question comes to us from Richard, who has a slew of alts he's interested in leveling quickly:
I've been playing for about a year now and have leveled a bunch of alts. My main and an alt are 70 and 64, respectively. But I have a bunch of alts all in the 10-35 range that I would like to get up in level. Some of my friends are in the same boat and we're trying to figure out the best way to maximize our leveling time. I've heard everything from solo'ing is faster, to run same level groups, to a high level 5-man instance with a couple high levels and have the lowbie hang back as you clear the place. I'd love to hear people's ideas on power leveling alts.
So, what's your strategy for the quickest power leveling? How do you maximize your time with your alts?

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This article was originally published on WoW Insider.