There may be a time when you need to whip up a network diagram of your SharePoint farm. Like me, you may think..’where do I begin? and What do I use to create professional looking network diagrams?’.
Answer is here:
Microsoft has a fantastic set of stencils for Visio which you could use to create models of your server deployment environments:
Download here: http://www.microsoft.com/downloads/en/confirmation.aspx?familyid=88e03d22-8f42-4c9d-94ef-d8e48322d677
John Chapman has a more application approach to SharePoint. Download the Visio Stencils here:
My recommendation is to use Microsoft Visio 2010. Click here to read about the changes in Visio 2010