For those of you fed up of intricate blow-drying for root volume: try this at home. After washing your hair, tie it on the top of the head, and air-dry. The bun will look as sexy as Little My's in the picture above, so feel free to wash your hair in the evening and sleep with the bun. It's guaranteed to give lift and volume when you open the bun !
Oh, and use a soft scrunchie, not an elastic that will pull or break the hair.
And here's another tip: don't condition the roots, only the tips !
Update: winter 2010
I sleep every night with my hair piled on top of my head. I love the volume I get. I don´t use a scrunchie, but one of those huge toothy hair grips.