Hi JR
In 2007, PowerPoint uses the 'body text' font for text boxes so my advice
would be to set up your Theme Fonts to be the fonts you want to use. If you
do it this way then change your mind about the font you can change the Theme
Font (or which theme you are using) and it will update all of your text
boxes. If you use direct formatting on the text boxes they will not update.
An alternative approach is to select a text box formatted as you want ->
right click -> set as default autoshape. However, this will effect all the
settings (fill, lines, etc) of shapes and the text boxes will not update if
the Theme Font is changed. The Theme Fonts are kind of like 'Word Styles
Lite'.
The easiest way to see what I'm on about is to have a bit of a play. In a
new presentation, put 2 text boxes on a slide and change the font on one of
them to something really obvious (impact, alba, frosty, something like
that). Now go to design tab -> fonts -> change the theme. Can you see that
the text box you didn't re-format changes and the one with direct formatting
stays the same?
I hope that helps
Lucy