The latest working drafts are currently hosted in CVS on the ICU project, and can be found at the following locations.
http://www.unicode.org/cldr/data/docs/tr35.html
http://www.unicode.org/cldr/data/dtd/ldml.dtd
http://www.unicode.org/cldr/data/dtd/ldmlSupplemental.dtdAlpha or Beta files, if available, are found at the main cldr page.