USA

All the articles about larp in the USA: http://www.electro-larp.com/tag/usa

The US larp wiki: http://larpwiki.mortalisrpg.com/index.php?title=Main_Page

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Larps in the Northeast: http://nelarpnews.blogspot.fr/

Larp conventions in the USA

The New England Larp Conference: http://www.interactiveliterature.org/NEIL/nelcoConferences.html

Intercon Noir: http://www.interactiveliterature.org/N/

A larp conference in New York: http://livinggamesnyc.com/

A storytelling convention in California: http://www.wyrdcon.com/