Tonight I will be giving a talk at JavaForum Göteborg on code review and how it can be used by agile teams.
(If you heard me speak, please feel free to rate me at SpeakerRate)

Here are the (Swedish) slides:

As promised, here are the links to some code review tools

• Code Collaborator – commercial web based + Eclipse plugin (IntelliJ plugin coming)
  Code Collaborator is the one that was demoed during the talk!
• Klocwork Insight Pro – commercial web based
• Gerrit – free web based from Google, used for Android
• Jupiter – Open Source Eclipse plugin
• ReviewBoard – Open Source web based
• ReviewClipse – free Eclipse plugin
• AgileReview – Eclipse plugin
• Java Code Reviewer – Open Source web based
• IBM Collaborative Code Review – Eclipse plugin

In addition to this list, code review is one of the features of GitHub.

Some reading suggestions on code review:
Coding Horror blog entry
Free book from the authors of Code Collaborator
White paper from the authors of Klocwork

Update: A video recording of the talk is now available. Q&A part available here.