Can Subversion aid code reviews?

We're looking at code review processes here, and I would like to know
what people here in this forum do for code reviews. Can Subversion
itself supply help in a code review process? Some suggest that
"promotion groups" are the way to go, which Subversion does not support.
A basic process we have in mind goes something like this:

1. developer is assigned a task, builds the code, unit tests it.
2. The team lead reviews the code, and might assign work to make
changes.
3. The developer makes the changes and notifies the team lead
4. The final review is done and the task is closed.

Some core issues here around source control include, how to identify
what falls in the task (which will span several revisions), how to
report on code that is unreviewed, and how to flag said code as
reviewed.

This sounds to me like "branch by task", but we're not necessarily
talking about large tasks, and we don't want to branch frequently (let
alone have each team member branch for each of their tasks).
 
Suggestions?

--
David 
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