Examples of Interactive Design on the Web are:

-http://www.modularpeople.com/03/08.asp
The Modular Record Label website clearly and simply presents all the information that a fan of the label would be intrested with out any clicking of links untli you'v been presented with a title screen of what your about to visit, so you dont get lost.

http://www.coroflot.com/
The Coroflot industrial design portfolio website presents many user portfolios clearly with a simple side bar that lets you navigate back and forth from any page you at.