Icon Repositories, where you can get lots of free icons:

• http://www.iconarchive.com/
  

Have a giff or other image, and you want to turn it into a icon?  Here's a good online tool to use:

• http://www.convertico.com/
  

Visio Icon's and images:

• http://www.visiocafe.com/ 
  
• http://visio.mvps.org/3rdparty.htm