Here’s a list of Visio stencils and other images I use in addition to the standard. I am intending this list to grow as and when I come across new or undiscovered sources.
Veeam:
Quality VMware specific stencils.
Josh Townsend – VMtoday:
Josh has some great stencils and images at VMtoday.com
http://vmtoday.com/2012/09/vmware-view-visio-stencil-download/
http://vmtoday.com/2012/09/new-vmware-icons-visio-stencil-download/
Data Dr:
Good for using some of the images and creating your own individual images.
Cisco:
All the usual networking related stencils .but some really useful Unified Computing stencils.
Virtualisation Related Cisco Stencils
Hyper-v Stencil
Some very good home made stencils.
VMware:
VMware specific stencils of very good quality.
http://communities.vmware.com/docs/DOC-11498
NEW 2012 VMWARE POWERPOINT ICONS & IMAGES
Visio Cafe:
Huge set of stencils for any need.
Maish Saidel-Keesing:
Very good Stencils and PP.
Netapp:
http://www.visiocafe.com/netapp.htm
Citrix:
http://community.citrix.com/display/ocb/2008/07/03/Visio+Stencils+for+the+Citrix+Dynamic+Delivery+Center
EMC:
VNX Stencils (you will need a powerlink account)
Xtravirt Presentation Pack 2.1
http://xtravirt.com/presentation-pack