At [https://trac.webkit.org/wiki/April%202010%20Meeting April 2010 Meeting] we talked about what is good and sad about the current state of code reviews. Here's some points that showed up:

Bugzilla Advantages:
 - Strong link between review and bugs and commit queue - integration
 - Comments are emailed out automatically
 - Full pretty printed diff
 - Patch history
 - Web based
 - Intra-line diff hightlight
 - Command line access to initiate review
 - Very low downtime
 - Low incompatiblilities
 - Fast
 - Multiple unrelated patches in a single bug

Bugzilla Caveats:
 - Inefficient line by line review
 - Diff between "patches revision" inside a bug
 - General unrefinement of bugzilla
 - No draft saving
 - No statistics about the patch properties on the bug report page (number of lines, new layout tests, etc)
 - Navigate the patch at the file level
 - Lack of context for each diff chunk
 - More granularity in "review result", to improve the clarity of the communication, like "r+ but with small changes"
 - Unclear accronyms (what does r+ means?), ramping up. Use more English words (?)
 - Review progress, especially in the case of multiple reviewers (who review which parts)
 - Lack of key bindings
 - Review on a cell phone / tablet (at least basic tasks)
 - It would be nice if there was only one account - DO NOT add a third account
 - Email based review
 - Syntax based highlighting

Don't care:
 - Review on top of review, on top of patch
 - Full commandline access
 - Single patch affecting multiple bugs

Requirements for replacement:
 - Keep similar process, integration in bugzilla

Action Items:
 - Prototype, prefer a dual-review system during transition, if a transition ever occurs.
 - Any prototype should update back bugzilla to stay in sync.
 - Fixes to bugzilla work flow are welcome

Alternatives:
 - Just incrementally fix caveats in bugzilla. Here's an example to start off: http://blog.fishsoup.net/2009/09/23/splinter-patch-review.
 - [http://code.google.com/p/rietveld Rietveld]. Nice, as some issues and requires significant integration effort.
 - [http://code.google.com/p/gerrit Gerrit2]. Nice but requires [UsingGitWithWebKit git].
 - [http://www.reviewboard.org Review board]. Some people pushing Mozilla to use it. See https://bugzilla.mozilla.org/show_bug.cgi?id=515210.