During the same trip to the Cowiche Canyon, I tied shooting a series of images for a stitched panoramic. I wasn't as careful to keep the rotation angles even as I probabl should have been, but it still stitched quite well in Photoshop CS3. It stithced together surprisingly nicely.
For those that are interested in how I did it, here's some technical info:
I used a Nikon D80 with a 105mm f/2.8 VR Micro lens. I use a Really Right Stuff generic L-bracket for this camera, as it mates perfectly with my RRS clamps. The tripod is a Really Right Stuff groundpod, and the head is a suprisingly small RRS BH-40. I used an RRS panning clamp, and for a nodal slide I used my RRS macro focussing rail. I shot seven images.
To stitch the images together, I used the included action in Photoshop. The only post-stitch tweakig I did was a little bit of cropping and a little bit of levels adjustment to boost the constrast a bit.