Let me just point out something that for me is the total clincher in PTGUI's defense for the shareware fee. Automatic control point generation, and I'll say this, it's awesome. Since switching to PTGUI I don't generate them by hand at all. Using other software it was THE most boring thing to do. PTGUI can accurately generate hundreds for each pair of photos in a few seconds.

Now, Hugin, thought I'd just have a look as someone mentioned it and I see this in the manual... "For the first control point you will then need to go to the other image and click the corresponding location". Erm, okay, that would be a little like taking my computer away and giving me back a typewriter. I'm not knocking Hugin, but to call it a perfect freeware alternative is only fair if you ignore a feature in PTGUI of such MAMMOTH time saving proportions as AUTO CONTROL POINTS. Sorry, I know it's not an in-depth review, but hopefully that will give some people something significant to test between the two :)