The German trial versions of Microsoft Expression Studio are now available. The full versions will be available in about 6 weeks, Expression Web is already available.
For further details visit the Microsoft Expression Web site. If you have a MSDN subscription you will find Expression Studio, Blend and Web in your downloads.
Note: to develop Silverlight 1.1 applications you need Microsoft Expression Blend 2 which is currently available as a preview version (free trial).