What's the difference between osteoarthritis & rheumatoid arthritis?

Check out links below.
References :
http://www.niams.nih.gov/hi/topics/arthritis/oahandout.htm
http://www.arthritis.org/conditions/DiseaseCenter/RA/default.asp

i think osteo is like when on those commercials where they have the women and they're all old and stuff and the commercial's about osteoperosis (sp?). so maybe the osteo kind is when your bones are deteriating and getting weak
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http://www.ra.com/ra/rastore/cgi-bin/ProdSubEV_Cat_200156_NavRoot_303.htm
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osteo arthritis is arthritis developed due to age damage etc but rheumatoid arthiriis is mainly because of autoimmune disorders
clinicaly they are almost the same but rheumatoid is symmetrical and osteo arthritis can be monoarthritis also
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osteo is for the bones and rheumatoid is for the joints.
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Rheumatoid Arthritis is your body's immune system attacking the joint. Osteoarthritis is a lose of bone that causes weakening and pain and occurs over time.
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Rheumatiod arthritis affects the joints and can cripple you. It can cause severe malformations in the body.

Osteo affects the bone, and normally doesn't cause the more serious conditions.
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Rheumatoid arthritis (RA) is an autoimmune disease. Normally cells called antibodies, produced by the body's immune system, attack foreign substances such as viruses and bacteria. With autoimmune diseases, the immune system mistakes the person's own tissue as foreign and attacks it.

With RA, antibodies attack the membranes around joints (synovial membranes) causing swelling, pain, stiffness and in some cases, deformity. RA also causes inflammation of the sheaths around tendons (which join muscles to bones). Eventually, there may be erosion of the smooth articular cartilage, which covers the ends of the bones in joints, or the bone itself.

Osteoarthritis is a type of arthritis that is caused by the breakdown and eventual loss of the cartilage of one or more joints. Cartilage is a protein substance that serves as a "cushion" between the bones of the joints. Osteoarthritis is also known as degenerative arthritis. Among the over 100 different types of arthritis conditions, osteoarthritis is the most common, affecting over 20 million people in the United States. Osteoarthritis occurs more frequently as we age. Before age 45, osteoarthritis occurs more frequently in males. After age 55 years, it occurs more frequently in females. In the United States, all races appear equally affected. A higher incidence of osteoarthritis exists in the Japanese population, while South African blacks, East Indians and Southern Chinese have lower rates.

Osteoarthritis commonly affects the hands, feet, spine, and large weight-bearing joints, such as the hips and knees. Most cases of osteoarthritis have no known cause and are referred to as primary osteoarthritis. When the cause of the osteoarthritis is known, the condition is referred to as secondary osteoarthritis
References :
Medicine