Last week I released some minor updates to Team Deploy.  When you use Team Deploy to deploy your MSIs, it will update the build steps and show that it is deploying.  The second feature will now write any non-zero return code to the build log.  Before this, these return codes were being lost.  In the next release of Team Deploy I will build upon this and allow you to pass in an XML file contain return codes.  If they are an error, warning or information.  For errors, I will make it so it will actually fail the build.

Here's the release
http://www.codeplex.com/teamdeploy

Mike