After playing with PTGui I was getting annoyed it wouldn't stitch grey
clouds or blue sky so went back to try it with Austopano pro.
Happy with the results
http://www.flickr.com/photos/silvermoon/2238933818/sizes/l/
I tried a 69 picture stitch with PTGui but it was leaving off large
area's of cloud once again back to Autopano pro.
This one took forever to render.
http://www.flickr.com/photos/silvermoon/2236000419/sizes/l/
To view at 30% original file size (flickr limits to 10mb upload) click
ORIGINAL above the image. Works out just on 9mb.