About 23 objects as of date and the promise of more. They have an English page but with a lot less stuff on it. I don’t think a translation is needed though.

http://www.winhard.de/objekte/gdl_samples1.html

EDIT :: 17 April 2008

The site has been restructured and the previous link doesn’t work, so you’ll have to try this:
http://www.winhard.de/deutsch/gdl/gdl03.html

• 2007.11.01 : ArchiCAD objects from Kinnarps Furniture
• 2006.05.03 : GDL Furniture Objects from Wilkhahn
• 2006.06.30 : GDL Toolbox - Freeware
• 2007.11.22 : GDL Toolbox only in Hungarian
• 2005.01.05 : Another link for OttoPDF
• 2006.09.11 : SelfGDL - The GDL Compendium