Tripod or Handheld - I know, I know; if you want real control and sharpness, use a tripod. Often I do, especially for macro work; and when I use a tripod, I tend to use Live View. However, at least 80% of my shots, including macro, are hand held. I love the flexibility. Plus, when I am shooting hand held, I do a much better job of working a subject or a scene. Unless I am very intentional, a tripod locks me in more than I like. With a D700, I can run up the ISO and shoot at a high shutter speed.
@CElliottUK: For the most part, I haven't had problems with the ambient light. If I do, I use a Hoodman loupe
@B. Thomas: Agreed!