Kind of what I was thinking Matt, is it really a good idea to give people a hard time about wanting to be safe. Particularly when you are in a position of people trying to follow your example.
For the record I normally have a knife on board but not on my PFD. On my PFD I usually keep a hook knife. They are great for quickly cutting line and you never have to worry about getting stuck or cutting your PFD.
This is the one I have from Benchmade. I see they now have some new ones that I may have to take a look at that may be better for the kayak.
http://www.benchmade.com/products/8