@andreww - These photos were taken with the Sigma DP2, and I did have a small tripod with me - a cheapie Sunpak XL1000 (I think I bought it at Target a few years ago), weighs only about 6 oz after modifying it, and it has a height of 18 inches or so, which is nice for getting above the grasses. My post production workflow is based primarily on Lightroom. I have some automation built into my imports, and they are customized for each camera/lens combination. I may spend a little time afterwards on some images in Photoshop as well, to add something like a graduated ND gradient or remove the errant moth from my skies :)
The other cameras that I spend the most time shooting with are the Olympus E-P1 and the Panasonic TS1.