Foods that are rich in purines are known to increase uric acid levels. Avoiding these foods can sometimes decrease the risk of gout attacks. The list that you refer to is below with the link to additional information concerning gout.
However, even with strict avoidance of these foods, gout will still occur if uric acid levels are too high. There are several medications available to lower uric acid levels in patients with gout (allopurinol, probenicid, and the recently approved febuxostat) ( http://www.hopkins-arthritis.org/arthritis-news/2009/Febuxostat-Approved-For-Gout-Treatment.html)