The Association for Integrative Studies - AIS http://www.units.muohio.edu/aisorg/
An interdisciplinary professional organization founded in 1979 to promote the interchange of ideas among scholars and administrators in all of the arts and sciences on intellectual and organizational issues related to furthering integrative studies. Interdis E-mail List is a list designed to promote the free exchange of ideas and information about topics such as integration, synthesis, interdisciplinarity.
The Santa Fe Institute http://www.santafe.edu/
"Operating as a small, visiting institution, SFI seeks to catalyze new collaborative, multidisciplinary projects that break down the barriers between the traditional disciplines, to spread its ideas and methodologies to other individuals and encourage the practical applications of its results".
The Three Pillars of Transdisciplinarity http://www.goodshare.org/pillars.htm
Seb Henagulph's essay provides a lucid framing of the geometry of relational versus rational perception and inquiry. The key multivalent 'connector' between the domains of the relational and rational which the author utilizes in weaving this tapestry of understanding is Stéphane Lupasco's notion of 'the included middle'.