Aplia

I have been looking at the look and feel of various textbooks in Aplia. I have looked at Boyes/Melvin, Krugman and Sexton on Aplia. The problem sets are of equal quality.
However, I like the Krugman book set up the best. All of the other publishers have scanned and provide the book one whole chapter at a time. Krugman's book is presented by sections. A student reading can be download one section of the chapter at a time. The other textbooks the student gets the whole chapter at once.
I also liked the fact that questions are peppered in between the sections of the chapter. This will force the students to interact with the reading.