How can I use a newly installed font as an input source? I just installed a new font, and I'd like to be able to type in it, system-wide, and not just within the confines of some application (e.g. MS Word.)  I already type in other languages using the Language &amp; Text preference pane.  Is there any way to use the TTF as a keyboard?

Thanks
You can not simply "type in another font" system-wide, since it is each application's responsibility to include support for fonts on its own. Installing a new font merely gives you the possibility to use it in applications, for example a plain-text application will never be able to handle fonts at all.

If what you want is to change the system font itself, then the answer is here: Can I change the font systemwide (10.8.3)