[jttraverse]

Thanks, I'd rather just leave one Mobi file and let users download that if I can be sure that they'll be able to read it on whatever Kindle they own.

Still, I think the Fire has 8mb internal memory and then 'the cloud'...but does anyone know if older Kindles ever come up against any internal memory/file size limitations. I've just been wondering why Amazon would bother stripping out and delivering a user just one or the other rather than just giving them the newer combined Mobi/KF8...especially on books that are pretty small size to begin with.
-JT