Barlin makes a good point.
Right now, you only can download the entire thing, that whole book as one single podcast. But podcasting was created so you could send out individual 'episodes' of a show. In this case, the 'episode' would be the chapter from the President Kimball book, with the first week being the First Presidency message.
There are three possible podcasts I can think of now.
1. Twice a month, a chapter from the President Kimball book, current with that month's lessons from the book..
2. three times a month, starting with the First Presidency Message for that month, followed by the two lessons for that month being broadcast over the next two weeks.
3. A 'general conference' podcast, with single talk broadcasts, could be set up so that people could download them daily, weekly, etc.
That would also generate more hits on podcast directories, I think that the two podcasts that are already there show up on all of them now, but this would keep showing things more 'up front' and current.