For the past few years, the Liquid Logic crew has organized a self-support trip through Marble and Grand Canyons in the winter.
http://kayakcamping.amongstit.com/
http://www.astralbuoyancy.com/news/expedition/grand-canyon-first-time-reflections/
http://www.teamliquidlogic.com/self-support-grand-canyon
This year, I am on the trip list. Deposit is in, and plans are made. I am very excited to get back into The Canyon!!!
http://www.kickstarter.com/projects/artandwater/grand-canyon-gravure?ref=card