I tried for the first time doing a pano at about 3/4 full zoom by hand. It's not that big of an area but is +400MB.   As you can see I obviously missed a few spots (guess I'm just used to non-zoomed).  But there seems to be several weird processing artifacts showing up.  The weirdest is this one:  http://photosynth.net/view.aspx?cid=c6ac292d-d42a-4c02-af73-fa9ae6475bc3&m=false&i=0:0:0&c=0:0:0&z=15604.0247152887&d=-1.0901000750616:-1.40004298860897:-1.38198751872457&p=0:0&t=False  It seems to extend to the top of the pano.  What's the cause of this blurry band?

A few other spots are blurry, which I think I could write off as changing cloud patters or visual distortion from the wind.  Any thoughts?

After trying a few more times at full zoom, I'm pretty sure it is a combination of not holding the camera steady enough and to a minor extent distortion.  The banding seen in the image is just after-effects from the processing.