Lots of user hints on one of the devs blogs, or at minimum ideas on how to turn it into a small user-tutorial.

• http://cyrilleberger.blogspot.com/2008/04/drawing-assistant-ruler.html
• http://cyrilleberger.blogspot.com/2007/12/first-panorama-in-krita.html (Cyrille: not in Krita 2.0)
• http://cyrilleberger.blogspot.com/2007/12/painting-in-hdr-with-krita.html
• http://cyrilleberger.blogspot.com/2007/11/true-story-of-perlin-noise-filter.html
• http://cyrilleberger.blogspot.com/2007/06/drawing-and-expansion-new-usefull.html (Cyrille: part of krita-plugins)
• http://cyrilleberger.blogspot.com/2007/03/creating-hdr-images-in-krita.html

These 3 are all about the same thing (Cyrille: not at all, it's three totaly different thing);

• http://cyrilleberger.blogspot.com/2006/09/perspective-transform.html
• http://cyrilleberger.blogspot.com/2006/09/duplicate-with-perspective-correction.html
• http://cyrilleberger.blogspot.com/2006/07/perspective-grid.html

Cheers!