Yup I have, I've also heard of mad cows disease, e-coli, botulism (sp), mutiple possible diseases from crustaceans/ mollusks, raw fish, rare beef, I've heard of trichonosis (sp again) distemper, rabies, salmonella (sp boy this is tough)
If you read the truth about the mercury contents in fish and use some sensable practices it isn't at all difficult to avoid any real danger and eat fish to your hearts content.
The United States has become a scare tatic and lawsuit ridden world where isolated and extremely minimal issues are glorified to seem like serious problems. People may chose to eat and beleive what they want but I personally refuse to go through life scared of everything the media wants to scare me with. I won't be filing a suit against a sushi bar when I get sick, and it irritates me to have to read the liability waivers everywhere I go. I try to eat fish at least 5 meals a week as well. and limit red meat to breakfast and the occasional beef shashimi appetizer at the sushi bar. I don't eat racoon during distemper season, I cook ground beef very well, and eat my steaks very rare. I eat raw oysters a couple times a week if I can as well. I never fish in lakes or rivers that are at the high end of the mercury warnings, and don't eat large predator fish in large quantities. But the way mercury concentrations work, there is really far less danger than the warnings indicate. the warnings are designed to absolve doctors, dieticians and Fish and Game departments of any possible liability for the 1 in 1 million problem that will arise.
Just my 2 cents worth