Better Web Application Framework -- Awesome video comparison of 6 frameworks
video.google.com
video.google.com
Forgiving the overwhelming simplicity of the sample project, the video gives little insight on how difficult it is to modify and fine tune interfaces, with the notable exception of pointing out if they work in "html editors". I do not know a single serious developer who would trust his html to a wysiwyg html editor.
J2EE sucks. Rails, Django, WebGears, and Zope are pretty nice.
The problem with this demo is that both examples (hello world, and a time tracking app) are very simple examples. While it's very easy to do simple things in Rails (can't speak for the others), it's still hard to do moderately to very complex things. There's no magic bullet.
That said, Rails, etc to make things more fun and take some of the grunt work out.