I think you may be looking in the wrong place; the dumps moved sometime in the past few months. dewiki dumps from March are linked from: http://download.wikimedia.org/dewiki/20060320/
You can check http://download.wikimedia.org for periodic updates.
-B.
On Fri, 2006-03-24 at 00:20 +0100, Stefan F. Keller wrote:
We started experimenting on local dumps then moved to toolserver because dumps are really outdated (currently dewiki is still 2005-Dec-11!). If dumps would be available, say, at a daily or weekly basis, that would be a choice.