I'm a great fan of ReviewBoard, the best opensource code review tool. Great to see that they are improving. Its greatest problem is the difficulty to install. Does anybody knows about an easy downloadable virtual machine image?
Installation difficulty seems to very much depend on the environment. On many systems, it's trivial. A couple commands, and you're good to go. On others, it's far more difficult.
I'd love to hear where you've hit problems. One of my primary tasks at this moment is improving our installation story for the systems where it's more difficult, and knowing what problems people are hitting will help me in that work.