I don't know of any coworking locations on Oahu, but I'd like to. Please update this page if you know of any.
Coworking Group in Honolulu
Been running an informal coworking group for about a month (approx 4 meetings so far) out of Glazer's Coffee near UH. Going to try it at the Tropical Smoothie Cafe on Tuesday, July 8, 2008 from 8am till noon. See event post on TechHui. Organized by Truman Leung of Ascribe Data Systems. (Note added July 1, 2008)