A new feature will allow you to preview your font folders.
Thomas Beck writes:
Hi Blender girls & guys!
I'm very proud to report that our development efforts towards giving Blender font preview capabilities has finally made it into the Blender 2.75 development version. Developed while being at coding holidays (and skiing a bit ;) ) and planned for inclusion before Easter we didn't quite did it on time - but now it's ready for you. If you'd like to see the development steps just look here.
I hope that this development makes Blender a bit more useful to our motion graphics department by making it needless to preselect your fonts with external applications.
How can I use it?
Just open a fresh Blender build from http://builder.blender.org/download/, add a text object and load a new font in the "object data" tab. Then, in the upper icon row, switch to "preview" display mode and enjoy the preview generation.
Have fun & happy blending,