#51 - http://www.ibm.com/developerworks/xml/library/x-mashups.html As stated on the website, "Mashups are an exciting genre of interactive Web applications that draw upon content retrieved from external data sources to create entirely new and innovative services. They are a hallmark of the second generation of Web applications informally known as Web 2.0. This introductory article explores what it means to be a mashup, the different classes of popular mashups constructed today, and the enabling technologies that mashup developers leverage to create their applications. Additionally, you'll see many of the emerging technical and social challenges that mashup developers face."
#52 - http://www.serena.com/mashups/understanding-mashups/faq.html This website is about, "Mashups FAQ - Mashups 101."
#53 - http://www.answers.com/topic/mashup-web-application-hybrid This website is about,
"Wikipedia: Mashup (web application hybrid)."
#54 - http://en.wikipedia.org/wiki/Mashup_(web_application_hybrid) This is a Wikipedia site all about Mashups and examples.
#55 - http://www.computerworld.com.au/article/119466/make_mashups_secure?fp=16&fpid=1 Directly from the website, "Mashups offer unprecedented agility in developing lightweight Web applications for the enterprise. Here’s how to keep them from becoming a security risk."