While looking back through Nishijima Roshi's blog, I found a very nice explanation by him of the fundamentals of sitting Zazen, expressed in his own, lovely way of speaking and writing. It is always good to go back to the "basics", and Nishijima Roshi's personality really shines through in this. You might wish to have a look.

http://gudoblog-e.blogspot.com/search?q ... al+Side%22

Gassho, Jundo