The MLA Handbook for Writers of Research Papers, 7th Edition came out in April 2009. Here is an overview of the changes.
1. Italics instead of Underlining:
MLA no longer requires underlining. Titles, such as book and periodical titles, are now italicized rather than underlined.
Example: El-Erian, Mohammed. When Markets Collide. New York: Mc Graw Hill, 2008. Print.
2. Publication Medium:
In the past, print media were considered to be the default medium. In today’s electronic world, this is no longer true. Therefore, all entries in the list of Works Cited, the publication medium (Print, Web, DVD, Television, etc.) must be included.
Example:
English Standard Version. Bible Gateway. Web. 25 Oct. 2012.
The English Standard Version Bible. New York: Oxford University Press, 2009. Print.
3. URL Web Addresses:
The URLs for web sources are now optional. MLA suggests not using them but recognizes that some educators might still require them. Therefore, ask your teacher if he/she requires URLs for your web sources.
4. Indicate When Data is Missing:
Many sources do not have a date, publisher or pagination. MLA advises, where applicable, to write n. pag. for those sources without page numbers, n.d. for no date, and n.p. if name of the publisher or place of publication is omitted.
5. Drop Subscribing Library:
For online database citations, the name and location of the subscribing library is no longer required.
MLA Handbook for Writers of Research Papers. 7th ed. New York: MLA, 2009. Print.