Redmine has a very nice web viewer for Bazaar VCS. It is simple and intuitive. One of the thing it is missing is the ability to view sub-revisions that Bazaar supports to show the history of merges.

Right now in the revision history you can see the main revision history. If the change is a merge type of change then it would be nice to be able to click on the revision and get the sub-revision beneath it. A hierarchical view of revision history will be nice such that user is presented with a little "+" sign if there is a sub-revision. Upon clicking on the "+" sign it will expand to show the sub-revisions...something similar that QLog utility of Bazaar does.

I dont think there is any webviewer for Bazaar that does this. If Redmine can handle this then I am pretty sure it will be more widely accepted in Bazaar community ...not that it already is not :).