Due to a bug in PackageMaker in Xcode 3.1 beta, everything in MapServer 5.0.3-1 was installed directly in the root of the HD. This is fixed in 5.0.3-2. There are cleanup instructions on the download page.
Sorry for the mess.
“The beast is actively interested only in now, and, as it is always now and always shall be, there is an eternity of time for the accomplishment of objects.” – the wisdom of Tarzan