OH! By the way! This does not work:
LEDS.addLeds<LPD8806, 6, 7, BRG>(leds, NUM_LEDS);
But this does:
LEDS.addLeds<LPD8806, 7, 8, BRG>(leds, NUM_LEDS);
Notice the pin change.
With the string on pins 6 and 7, the strip turns white and you can barely make out some changes on it. On 7 and 8 it works fine.
I am using RC2 (dated Jun 27th on the download page).