Believe it or not, I've rooted my cuttings by sticking them in a glass of good water, and then place the glass near diffused lighting. Then I change out the water maybe once a week. Kind of like keeping cut flowers. I've been able to root ventricosa, hookeriana, and a few others that I can't remember right now with success. I usually leave three nodes and cut off the bottom leaf or two to give the stem room in the water. Then I whack the other leaves in half.
I know this isn't the recommended way, but I did it this way by accident because I didn't have any sphagnum moss and I had read in a book that said some people had success this and it worked! Once the stem split and little rootlets appeared, then I potted the cuttings up. Next time I take cuttings, I'll try the sphagnum way.
Joel