Given that Web Applications 1.0 (often referred to as either HTML5 or XHTML5) is still very much work in progress not much dated versions of the draft have been posted. This made it quite hard to track progress. Fortunately Ian now keeps the WHATWG drafts in subversion. I already had Cygwin installed for some CVS stuff. Adding subversion to that was not much of a hassle. A few help commands later I now have:
svn diff --old http://svn.whatwg.org/webapps/index@n --new http://svn.whatwg.org/webapps/index > diff.txt
… where n is the latest version I read or diffed against. Quite useful. Perhaps I should put some web service online for it one day… (For what it’s worth, I’m aware of the excellent GUI for Windows which appears to have two homepages: tortoisesvn.tigris.org and tortoisesvn.sourceforge.net. I just like to use the command line.)