I am familiar with Birth Arts International and I do birth doula trainings for them. I like the fact that they have a distance portion or the option of doing a weekend training. Now that BAI has finished putting together the online classrooms, those who take the weekend workshop are going to be able to then log into the online classroom to complete assignments and such, which I think is a pretty cool option. If you have any questions, you can PM me and I will try to answer them for you!
I have also heard great things about toLabor (well, about ALACE, which then became toLabor), but I just don't have any personal experience with their curriculum.
Erika, mama to three beautiful kids (plus one gestating), and wife to one fantastic man.