The article reviews requirements and tool availability for knowledge management in virtual communities and other knowledge sharing environments, where professionals wish to quickly and easily share knowledge and information. The article compares the characteristics of several newer technologies, notably weblogs (blogs) and wikis, to the more conventional discussion forums. Wikis, the currently least popular technology emerged as the one best facilitating knowledge management needs. The article concludes that although discussion forums are the most popular, the best technology fit depends on the community type. Some opportunities for research in this area are identified, especially for the database community.