Software for Making Company Diagrams?

gaudenz asks: "We have a network with Linux, Solaris, Mac and Windows and need a software to paint simple diagrams, such as used in deployment. The actual requirements are simple: The tool must export to postscript, support fonts, boxes with multiple lines of text, and connections between these boxes. We found Visio with VMWare to be the best solution, JGraphpad 5 looks promising, too. Since diagrams are a common thing in development companies I was hoping others have made a comparison, too, and may come up with some other ideas to solve this problem."