Just finished the first beta version of our tagcloud generator.
It displays german special chars correctly as far as they are implemented into a page with the appropriate tags. Keywords are included in the weighing. At the moment, english "fillwords" are not filtered, this version is intended for the german market.
If you wish to try it, check out this: http://www.artviper.ch ( scroll down, left side is the link ).
Comments, error reports and critics highly appreciated,
thanks!