Visio 2003 uses UML 1.4, which means that some stereotypes from UML 2.0 simply don't exist, and they need to be modeled by freehand drawing (I may as well be using Photoshop). Does anyone know of an update from Microsoft or an addon to include UML 2.0 (complete - not just class diagrams) in Visio 2003?
I found this package: http://www.sdl.sandrila.co.uk/ but judging by their "example" screenshots, I'm going to stay away. If they don't know how to use UML, I'd be surprised if they could implement it correctly ;)
This set of Visio stencils and templates for UML 2.0 is excellent: