There are several application templates (and a Rails gem) that add HTML5 Boilerplate to a Rails application. So I investigated and put together an analysis of HTML5 Boilerplate for Rails. It seems HTML5 Boilerplate doesn't add much that isn't already there in a new Rails app. What's useful:
sample humans.txt file
example index.html file for a default application layout
viewport metatag
Google Analytics snippet
There's some CSS help like CSS normalization, placeholder CSS Media Queries, and CSS helper classes but it seems you'd get all of them and more with a CSS toolkit such as Skeleton, Twitter Bootstrap or Zurb Foundation.
Finally, HTML5 Boilerplate has lots of components for websites that need to support IE6, 7, and 8 such as IE conditional comments, Modernizr, and Chrome Frame. But if I'm not supporting IE6 and I'm using Twitter Bootstrap or Zurb Foundation I don't think I need these.
HTML5 Boilerplate is a good project that has lots of community input. There's a lot of good advice on its website. But for a Rails project?
Am I missing something? What is the value of HTML5 Boilerplate for a Rails application?