What does CruiseControl (or any other CI tool) provide more than a well-written (n) Ant?

Question

We have a large collection of nAnt scripts that create our various products. They almost all have the following structure:

• Delete the old working copy.
• Complete a full copy of version control.
• Increase the build number in the corresponding file (user task nAnt).
• Run static analysis (StyleCop, Perl scripts)
• Building a solution using Visual Studio - ends with the release of MSI.
• Running unit tests (nUnit, JSUnit)
• Run Static Analysis (FxCop)
• Complete sending results (MSI, readme, etc.) to a well-known package.
• Put this zip package on the server share.
• Email results for the team.

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