I actually use a (paid for) version of PTGui or an older program, Calico 2, on Mac, on the comparatively rare but nevertheless important occasions when I need a panorama. PTGui is very highly credentialed and I used the demo successfully, but the last time I used it -- after buying it -- I had a real battle to get the result I wanted. Odd.
I raised Autostitch here only because, as I said, I saw it positively mentioned elsewhere.
I've seen lots of work done with ICE, Bob -- excellent results. Why on earth doesn't MS support it? Amazing.
Cheers, geoff