This morning I discovered sventon (http://www.sventon.org) a Subversion (http://subversion.tigris.org/) repository browser written in Java. And it's free! Ten minutes later I had this integrated as a Repository browser in Hudson (https://hudson.dev.java.net/ will be available in build 1.157) and I'm loving it. It's not quite as good as fisheye... but it does everything I need it to!
Hudson is really starting to have kick-ass features that leave everything else for dust.