I was reading about this technique over in the
Technique group on Flickr. Basically, in 3 steps you can take a panorama and turn it into a little planet

The thread on Flickr has much better examples than I was able to come up with. Anyways...
1. Take a panorama picture (or crop a normal picture so it's more like a panorama)
2. In your photo editing program of choice change the image size so that the height is equal to the width (in Photoshop Image -> Resize Image -> Deselect the checkbox for maintaining the proportions -> type the same number for height that is there for width)
3. Rotate the picture by 180 degrees.
4. Use the Distort -> Polar Coordinates filter and just use the default settings.
You might have to clone some stuff to make the edges meet up so they don't look strange. This was about the best I could do based on the landscape of Wellington, but I still thought it was a fun little photoshop project