Thanks for the comments everyone.
Editing: Everything was shot in Raw and converted to Tiff files using RawShooter. The program was downloaded on my way out the door to Australia, so, along with the new camera and housing, I added another layer to the learning curve.
The color space is sRGB. I'm not really up on this type of thing so perhaps something isn't right. It would help if those that see the pics as too dark, would look at my other galleries and let me know how the Ningaloo one compares.
I edit on a Toshiba Tecra laptop that does indeed have an extremely bright screen. I've run into the issue of seeing edited shots a bit darker than I desire when viewing them on my office PC. In any case, they can be adjusted brighter and I'll keep that in mind when my next trip photos go on my site.
Saturation: When Alex posted his first D2x shots, they looked a bit oversaturated to me also. Saturation can of course be tweaked in PS but, it may be that we are seeing colors that were muted somewhat by other cameras and now are coming through much more deeply saturated than imagined. Not sure on that. Haven't printed anything out yet. That will give me a better idea of final output.
Alex: Yes, there are lots of critters on the Reef there. Part of my motivation for going was the cleaning activity shots alcina has posted. For every shot you see of cleaners, I blew two. A patient person would have come back with much more. In fact, as I look back on it, there was more activity there than anyplace I've ever dove. This is without seeing the Whalesharks and Mantas that were there but due to the things that sometimes happen on dive trips, weren't photographed.
In Australia, they call Frogfish, Anglerfish. And the one that is labled a Frogfish, reminds me of those Toadfish you see in Cozumel. Just used the names that they called them there. I'll look into the Wobegone and see why it's not loading.
Karl, in general, a brighter view finder and larger LCD screen are the two things I've noticed most. In even darker water, I could see well enough for critical focus using MF. My light died on the third dive one day and instead of replacing it with my backup light, was able to see well enough to continue shooting.
I'm determined to try AF more in PNG. I'm sure it's faster and better in low light than the D70 but my experience is limited.
As for the other 1/2 of the experience, editing: better color saturation, finer detail and of course larger files allow cropping without as much pixelating when enlarged.
The images look so much better full screen. It's not reliable to judge these images reduced in size for the web.
Thanks again.
Rand