My Blog has an example on how to integrate CruiseControl.net projectstatus information into Sharepoint Portal Server 2007 via 2 webparts.

The binaries for the 2 webparts are for dutch people. But with the sources and some knowledge on Sharepoint it is easy to make english versions of the two. Will post the english webparts upon request.

Webparts are available on codeplex: http://www.codeplex.com/tamtam/Release/ProjectReleases.aspx?ReleaseId=4851

Blog: http://blogs.tamtam.nl/stef/PermaLink.aspx?guid=f45d385d-0c85-4823-82cb-7a83eeb4ef28