Also check testimony of executives at Congressional hearings as well as interviews.
Newsweek - "What the Spill Will Kill" (cover story 6/14).
In addition, most Library news databases have a way to limit to a "cover story" - which is ideal for overviews on a topic. Tech users can access Academic Search Complete, LexisNexis Academic, Research Library (ProQuest), and Factiva (links from "Databases" tab).
National newspapers such as the New York Times, Washington Post, and Wall Street Journal cover this disaster daily - fully accessible via ProQuest Newspapers or Factiva databases.