Research on the internet isn't so straight forward if you are using an iPad or laptop. You can book mark sites you like, but you can't annotate them or highlight key passages. If you copy and paste the text of the article you also have to remember to copy the URL of the site.
Dot ePub solves this problem nicely by allowing you to create an eBook of any web site. This works particularly well on the iPad and it's also the subject of my latest EdSocialMedia post.