We use IBM Rational Clearcase/Clearquest (not my choice). The tool for codereview was written on top of that by us. It just queries the current view to see what has been checked in, marks those files as being 'under review', and sends the review. Then the reviewer retrieves that into a temp directory, which marks those files as being retrieved for review, and gets to see all the diffs, as well as the full original and modified code. When done, the tool is invoked yet again to mark the files as passed review, and emails/logs in clearquest the comments, if any. The problem here for me is that these marks are singletons - you can't mark a file more than once. The purpose of the marks is so that a rejected review that results in further changes only needs to review those changes, not the whole thing again, because the tool will see that some files are already reviewed, but if you checkout/checkin again, the new versions of those files don't have the mark and get reviewed again.
Of course, the tool is written in perl. ;-)
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