Interestingly, I used the inbuilt flash on my D60 (Canon) for a while and was quite happy with the results. Not perfect, but certainly usable imho.
Good shots Baz, although the first one isn't a stink bug. Flash is the way to go with macro imho. When I get a Mark IV, then I'll be doing natural light macro images. Here's a fly shot, natural light that I took from a few years ago:
http://www.macro-images.com/images/M...s/F79C8528.jpg
Dave