Infoworld offers a brief article on a couple of companies who have released products that I'd call knowledge management for the individual.

Near-Time, is offering Flow--a "peer-to-peer CM (content management) and KM software that allows users to access, manage, and repurpose content using a range of standards."

Learning Management Solutions has a product called KnowledgeWorkshop--which "allows users to create personally relevant associations and connections between information drawn from a variety of sources, including Web pages, e-mail, documents, PowerPoint slides, databases, and spreadsheets."