Visio 2007 has a new Themes feature, which will let you set the font for a
single page or all the pages in a Visio diagram. Once the theme is applied,
any existing text and any new text you enter in that diagram will be in that
font. The theme color schemes included in Visio 2007 are the same set as
those in other Office 2007 applications. So it will be somewhat easier to
set a default font and apply consistent formatting.