Links: Visio Stencils for Designing Sites, Processes, SharePoint

Visio Stencils for Information Architects
http://www.nickfinck.com/stencils.html

Visio stencils for designing Sharepoint sites
http://demiliani.com/blog/archive/2006/01/23/3398.aspx

Visio template and stencil for designing SharePoint sites (beta) http://blogs.msdn.com/roberdan/archive/2006/03/05/543967.aspx