Here's a couple of nighttime photos from the Plano Balloon Festival in Texas. This is a great event - I didn't get up early enough for the morning launch, but I did catch the evening one. However, the best photo opportunities were during the "glow" after the sun went down. They let spectators walk amongst the balloons before clearing them out for fireworks. More shots at my Flickr set.
These were all taken with a Nikon D700 plus 24-70mm and 70-200mm VR lenses.