This paper presents a tool for semantic personal knowledge management called Hypertext Knowledge Workbench (HKW), an editor and browser for semantic personal knowledge models. The tool is designed to be used by a single person to manage her personal notes about any topic that seems relevant. Existing wikis and semantic wikis represent content as pages with a title and content. Hypertext-based Knowledge Workbench (HKW) offers a more powerful yet simple to use conceptual model and allows entering and using knowledge in different degrees of granularity and formality.