Edit: mea culpa, I realise now that Tourmake seems to be accessible to Streetview Trusted photographers only, and that they recently have changed something into their business model, it has a yearly subscription to access the software.
To be forgiven, let me just share to you the world's biggest panorama, shot in the Mont Blanc valley: http://www.in2white.com . 365 gigapixels, 70K pictures taken.