Regarding the parallax, when I first tried this panorama in 2005 I had no idea about panoramic photography and knew nothing about nodal points etc. I knew what I wanted to do creatively but had to learn the technical skills required to pull it off, hence lots of hours in Photoshop to stitch the 13 images together.
In the last two years I have done a lot of studying and experimentation and have got some great results with my P25 and RRS set up, especially as lots of the panoramas that I've made have foreground elements.
In my opinion, panoramic software has come a long way in 2 years and all the major players have made improvements and added new features.
I agree with Bernard that multiple exposures would look better and Seitz are working on having a multiple HDR mode in the software that will automatically scan and assemble different exposures and then output the combined result as a JPEG or TIFF file.
When I made this panorama on Sep 21st, I saved the photograph as a TIFF file because no software could open a DNG with >30,000 pixels (at that time not even the software that came with the camera could open a Roundshot DNG file!) It took 4 minutes to process and save the TIFF file. Four minutes later I did a second scan but the light had changed so much.
I would love to use Lightroom or ACR4.2 with these DNG files but they are bigger than 30,000 and it's just not possible.
I am experimenting with multiple exposures and Photomatix software. The development team at HDRsoft are working with Seitz and hope to support the large DNG files from the D3 cameras in the future.
Seitz are aware of the problems and are working at a variety of solutions. However, a few hours of post processing results in a stunning, highly detailed panorama that is getting a lot of 'wows' from my clients and more importantly a few sales to help pay for the camera.
I'm off to the Grand Canyon, Bryce and Zion at the weekend and looking forward to what I can photograph with the Roundshot D3 in those locations.