If you're interested in the Rails 3 side of things, here is also an hour of your time: * New Router can route other Rails apps, Sinatra apps, and possibly apps

If you're interested in the Rails 3 side of things, here is also an hour of your time: * New Router can route other Rails apps, Sinatra apps, and possibly apps from non-Ruby frameworks (he mentions Django) * New Javascript agnosticism uses HTML5's data-* attributes * ERB's html_escape on by default, <%=raw to escape escaping * Lots non-public-facing stuff being refactored