There's a new version of Kangaroo available :

http://www.food4rhino.com/project/kangaroo

It contains numerous new additions, described in more detail here:

http://www.grasshopper3d.com/group/kangaroo/forum/topics/new-release-and-examples

Also - a while ago I taught a workshop using Kangaroo at Aarhus school of architecture (thanks to the school, and to all the students who worked amazingly hard, and made it a real pleasure!), and for this created a 3-part video tutorial on using Kangaroo to model tensile surfaces. You can watch these, and download the associated examples from here:

http://vimeo.com/27484394

http://vimeo.com/27489089

http://vimeo.com/27491050

Enjoy!