I'd really rather keep all my e-books in one system (iBooks), but once again the price difference just doesn't justify it: $28 dollars here versus just over $15 for the Kindle app.

This book is $22 for the Kindle and $21.78 for the paper back version, yet they are trying to charge $28 for the iBooks version? You mean, it costs them $6 to NOT HAVE TO PRINT anything? I think this is also a violation of Apple's iBookstore terms. I believe Apple requires publishers to not charge more on the iBookstore than they do elsewhere, yet Pearson is doing this here. Hopefully by the time you read this, Pearson will have changed their policy and started treating us like desirable customers.