We have a formal-informal code review tool that inspects our code tree, finds what has changed, creates diffs, etc., and emails them to the reviewer. It also appends a note in the bug-tracking tool to say that this has been done. Once the reviewer is done, s/he runs the tool again to mark it as complete, which sends a note back to the originator AND updates the bug-tracking tool with the comments. This may need to be done again if large enough changes are required to address the comments.
The advantage here is really asynchronicity. You don't need to find time for everyone to get together at the same time. Theoretically, you should still be able to have multiple reviewers (due to a limitation of the tools, we can't right now, but we've requested fixes to the tools to allow it) all able to provide feedback. You definitely get documentation - it's in the defect remarks, as are the comments so generated. Now, whether that's a GOOD place for the documentation is debatable.
In our case, we don't generally have a lot of experts in any given area of the code, so we can't really get a huge group together anyway. (Note that in our definition of "expert," if you even have a book on the subject in your office, you're considered an expert - we're not actually as picky as "expert" may sound).
We also hold much more formal reviews once in a while. But I find those to be rare, for good or bad.
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