Wow, thank you so much for this! I finally was able to change the font on my Kindle 1--I hated the default font that came with my Kindle 1.
Now I'll go back to reading it (I had switch my alliances over to my OpenInkpot enhanced BeBook because I could load my own fonts).
I did make a minor change though; I replaced your font with "DroidSerifRegular"--I like serif fonts better.
Worked like a charm and now my kindle has a much better font. Yay!! You rock! I've been wanting to find a non-programming, non-PC way to do this. Thank you, thank you!