The daily work activities of knowledge workers (KWers) are characterized by a highly dynamic working style that challenges support by task management (TM) systems. In this paper we present the KASIMIR personal task management system that operates on Nepomuk Social Semantic Desktop. KASIMIR features a combination of a task sidebar with a set of task plug-ins into common desktop applications such as email clients and web browsers to tightly integrate the TM into the KWer's knowledge production activities. Thereby, KASIMIR exploits a KWer's task management activities to seamlessly create metadata within the KWer's personal semantic network. Based on this example, we present a mechanism that leverages actions the KWer performs anyway within the knowledge work process to create metadata. This is a powerful alternative to the common problem of enterprise environments that KWers lack the willingness to contribute effort to create annotations without receiving direct benefit. The evaluation of KASIMIR's task plug-in approach showed that it was well received.