I have been in participating in the Home Study Course since last October. Its a solid program, good instruction. There is lots of information about them on thier websites www.arnis.org and www.elite-fighters.com
One good thing is that they have rapid repsose to calls and emails.
The Lamkin Brothers, though are ranked under the Tracy system, provide a home study course using the EPAK 24 Technique curriculum. Of all the Home Study courses (written manuals) that I've seen, theirs is the most comprehensive. If anyone has read the Lampkin Brothers Library of Kenpo and the Guides to Mastery and know of a set that goes into more detail, let me know!