Elemental Mercury is found in manometers, some mercury switches and thermometers.
Elemental Mercury is also in the CFLs (Compact Fluoroscent Lightbulbs) that are popular now due to rising energy cost (approx 4 mg)
Organic mercury found in seafood is only toxic in high consistent doses - though has been catastrophic. See attached picture which was the award winning Time magazine cover of the year showing a mother holding her child who had congenital disfigurement due to mercury being dumped into Minamata Bay
Elemental Mercury is mostly a neurotoxin causing personality changes, nervousness, shyness and depression.
Acrodynia is pain and pink discoloration of hands and feet due to mercury poisoning in children.