I'm a consultant.  I need increased capabilities to draw technology
and business situations.  I need a great "toolkit" to use in
Visio/PowerPoint/Website.  I need pictures of servers, harddrives,
software components, web pages, business people, processes, etc.  A
great general clipart of many business and technology in enterprise.
THe clipart on these pages is a good example.  
http://otn.oracle.com/products/iportal/getstart/a_port01.htm

I'm in the business. You need to buy Microsoft Visio.  It has everything you need.

I already own VISIO.  It's a base line, providing some stencils and
tools.  It does *not* provide anything particular compelling like the
examples specified.  I wish Visio had everything i needed.

If you're looking for server and computer shapes, you might want to
take a look at http://www.VisioITKit.com/. It is a resource kit for
Visio 2003 that has thousands of computer-related shapes. It doesn't
have any shapes for processes and the like, but it has about 28,000
computer equipment shapes. Hope this helps.