At last week's Ancestral Health Symposium, Chris Kresser presented a talk on this very issue. Iron overload can be a problem for some and can be dangerous if not addressed.
We have mechanisms where the stomach can tell how much iron we have in our body stores, and when the body is low in iron, we absorb more from the gut. When we have enough iron, we don't absorb much or any iron. When everything is working correctly, a large iron intake should not be a problem.
However, there are mutations, such as Hereditary Hemochromatosis (mentioned in the article) that cause a problem with this regulatory mechanism and can result in iron overload. If that is the case, frequent blood donation is probably the best treatment. Chelators and chelating drugs that affect both iron absorption and excretion can also be taken. But I don't know what if any side effects there are from chelators, plus donating blood has the added benefit of helping others.
Chris recommends having your doctor perform an iron blood work to check your levels. Also, if you have any genetic testing, such as at 23andme.com they will tell you whether you have Hereditary Hemochromatosis.
Here is is list of references and some selected slides from Chris's talk:
Some interesting asides. Hereditary Hemochromatosis is thought by some to have originated in a single ancestor in what is now Ireland. According to the CDC, it is the most common inherited single gene disorder in people of Northern and Western European descent. Hereditary Hemochromatosis actually provides some protection against certain pathogens early in life before iron overload occurs and may have provided an evolutionary advantage in Europe during times of widespread plague (hence its success in becoming more widespread in the European population).