Hi Big pix,
I'm using PTmac from Kekus
http://www.kekus.com/.
The software's based on the panorama tools toolset, but recent versions are getting much easier to use. It's nowhere as easy to use as autostitch, but does provide a higher quality output with 16-bit support and output for Photoshop. They provide a demo/eval version.
The trick is, if you shoot around the nodal point of your lens, then stitching becomes a breeze. If you don't, expect third rate images with ghosting etc.
Alistair