I have been interested in the possibility of Air Layering Nepenthes, after all if they can be propagated by Stem cutting, why not Air layering? Plus you get (hopefully) a margin of error in which usually the cutting will either heal itself back to the main plant or root, so maybe, just maybe no deaths.
I found this link:
http://www.cpukforum.com/forum/index.php?showtopic=8130
http://aggie-horticulture.tamu.edu/e.../airlayer.html
Hoping to try this out soon myself.
I am not too sure though if it will work with very thin vined species, Gracilis, albomarginata for example, but maybe they still will, just delicate work in doing the cut.
TTFN
Arvin