Interfictions Zero, to be edited by Delia Sherman and Helen Pilinovsky, will be published online by the Interstitial Arts Foundations in late August of 2010.
Submission Guidelines for 
Interfictions Zero: The Virtual Anthology of Interstitial Writing and Original Essays
What Is Interstitial Writing? Interstitial writing breaks rules, ignores boundaries, cross-pollinates the fields of literature, and helps them […]

Huge thanks to everyone who’s signed up to create art for the Interfictions 2 Auction!  We now have over forty artists committed to creating original pieces of art based on the Interfictions anthology series of original interstitial writing.
The original deadline for mailing in finished work, originally Sept. 23, has now been moved to October 2nd (this Friday).  […]

By way of Geoffrey Long at MIT come two very interstitial calls for contributions. First, from H-Net:
THRESHOLDS, SOGLITUDES
Special issue edited by
Tatjana Barazon, Docteur en Philosophie de Paris IV-Sorbonne
THRESHOLDS, SOGLITUDES
This is an invitation to meditate on thresholds, the space where we enter a house […]