Recently I've written a simple Visual Studio add-in called ReviewMyCode. Here is the summary:
Peer code reviews are a proven way to improve software quality.
ReviewMyCode helps you overcome some barriers to this best practice with a simple Visual Studio 2008 add-in that fits your process. The team members can contribute to the review process without leaving the development environment.
The add-in works well within a team development environment by integrating the review process with the SVN source control management system.
