I've been using Dyneema soft shackles purchased on eBay for the past 2 years, for various things and with good results ( no failures). They're strong, lightweight, non-marring, and inexpensive. They work almost anywhere you might use a stainless shackle.

I noticed a thread on another discussion board that is motivating me to try making my own. Maybe something to play with this winter. http://www.cruisersforum.com/forums/f116/soft-shackles-what-is-the-latest-155318-2.html