I watch the NDP 07 from the Merlion area. Brought a wide angle zoom and a 400mm prime. The 400mm is too long a focal length. Low light is also a factor during the flypast unless you have a fast lens.
Bring a wide zoom lens 16/17/18-50/70/80mm and another one with a 300mm is best. A tripod + remote shutter best for fireworks.
Anyway, I didn't enjoy it as much while shooting and watching that time ;p.
This year I got tickets for the NDP and probably decide to kept my cam at home.
Kinda hassle with the large crowd to take pics.