Information Seeking gives users a wider range of access methods when retrieving business items (e.g. projects, products, skills, people, deliverables …) using (intra-) Web applications. The Information Seeking approach we propose is based on the concept of the "Item", as defined in the Hypertopic model that we propose for mediating various "socio-semantic Web" applications. We show on an example, in the case of a sustainable development projects cooperative e-catalogue, how items can be viewed "semiotically", depending on various tags, topics and points of view.