Ontology-based information seeking is one of the most promising approaches to enhance existing search interfaces with features enabling users to better express their information needs or to improve exploratory search styles. This entails the interaction of users with concepts and relations embodied in ontologies in a dialogue process that can be interpreted as a query or used as a sign to suggest other paths that could lead to casual encounters. In this paper, we describe a number of ontology-enabled search tactics that have been experienced in prototype experiments, along with other possible techniques that would eventually be useful, as pointed out by existing research on information seeking models.