Check out the previous thread:
I bought several of these fiberglass poles and made them into stakes. They are much better than stainless steel "cajun" anchors (not as loud or heavy and they have a little flex). It's basically the same material as the "stakeout stick", "wang anchor", etc........just a lot cheaper.
I've been using them for a couple of years, and I can't imagine using anything else (unless the water is deeper than 8 feet).