Herbs such as Turmeric, Boswellia, Devil's Claw, and Yucca are all beneficial for joint inflammation and arthritis, as are other herbs found in Joint Gold from Natural Wellbeing (http://www.naturalwellbeing.com/products/joint-gold)
Cat's Claw from South America has shown notable benefit for rheumatoid arthritis, in particular. See: http://www.naturalwellbeing.com/products/cats-claw
Omega-3 fish oils also provide excellent anti-inflammatory support and help modulate the immune system. See Omega-3 Plus: http://www.naturalwellbeing.com/products/omega-3-high-potency-DHA-and-EPA
Eating a whole-foods diet that emphasizes fresh vegetables and fruits, and minimizes wheat and flour products, sugar, red meat, and unhealthy fats (trans-fat, excess saturated fat) will also help to reduce inflammation that contributes to joint damage.