The Rise and Fall of the Oslo Peace Process

http://history.state.gov
The FRUS series, containing American documents on Iran, Iraq, and the Arabian Peninsula.

http://csis.org/
Includes access to volumes II and IV of the Lessons of Modern War series, which deal with the Iran-Iraq War and the Gulf War.

http://www.eia.gov/countries/mena/
Country briefs and energy data on the Gulf.

http://www.grc.net/
Website of the Gulf Research Center; many other research institutes offer further reports and analysis on regional politics and policy.

http://socialsciences.exeter.ac.uk/iais/research/centres/gulf/webresources/
A collection of region- and country-specific web resources compiled by the Centre for Gulf Studies at the University of Exeter.