MapServer 5.0 beta 1 is now available. Only in the dynamic framework edition for now. This is beta software. It will replace any 4.x installation, and if there are problems, follow the uninstall instructions in the readme and reinstall MapServer 4.
“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