Stummbled accross these Visio templates quite useful! and free

The UML stencil for Microsoft Visio supports all symbols of the UML 2.2, specified in OMG UML Superstructure Specification, formal/2009-02-02, as well as all previous versions, UML 2.1, UML 2.0, UML 1.5, UML 1.4, UML 1.3 and UML 1.1.

http://www.softwarestencils.com/uml/index.html#Visio2003