I got this in an email from the Personal Defense Network. Its a really cool article on EDC folding knives for defensive purposes. Its a good read. I think I am going to add the lanyard and be on the lookout for knife with a thumbhole to make a wave cut also. All my current knives have either a thumbstud or a finger flipper. Anyway, here is the link to the article.
Optimizing the Everyday Carry Folding Knife