Jane at Dear Author has a wonderful list of 10 things ebook merchants should be providing as a matter of course. Here’s just one example, but read the whole list:
Buy a for a friend. The only site that offers this feature is Fictionwise. Amazon does not even offer this for Kindle which makes no sense. When a reader wants to buy a book for a friend, she wants to buy a specific book. She doesn’t want to send a generic gift certificate and hope her friend uses it for said book.