I just came across a Photoshop plugin from Microsoft Research that allows you to publish panoramas to photosynth.net from inside Photoshop.
Very very cool. Check it out here: http://bit.ly/photosynthpluginforphotoshop
For those of you who have used ICE ( http://bit.ly/microsoftice ), and had it make one or two glaring errors in the middle of what is otherwise a beautiful stitch, you can export the ICE panorama as a layered Photoshop file, open the stitch in Photoshop, fix the stitching error by hand, and now publish the perfect copy to the Photosynth website.
I don't have a full copy of Photoshop to try it out with and I've already used up my free Photoshop trial on my computers, but those of you who have Photoshop should give it a go and let me know how it works for you.