I can only tell where I am selling the most ebooks, and that is definitely the Apple iBooks Store.  I think it is because of the way they are presented.  It’s easier to find Indy books among the listings at iBooks.  Once a book starts selling well, it shows up on Kindle lists, but otherwise it can just sit there.   Here are the sales to date for His Robot Wife.

* Kobo seems to be having a problem importing new books from Smashwords.  Both say they are working to fix this.  Note also Amazon includes both Amazon.com and Amazon.UK.