I think a regular Web Help file that is searchable and has an Index and TOC (via a Help Authoring Tool, aka, HAT) would be more useful than the book-like Help available now. I don’t have a HAT available but I bet the web pages that make up the Inkscape Manual could be easily imported (if they are available legally). Tutorials would be great but short of that a searchable Help file would be great.
 
sharpart