In any organization, the work gets done through teams — sales teams, project teams etc.. Is their work suited for Wiki? What information within their work would lend itself nicely to wiki?
For example — software projects. Is wiki relevant in execution of software projects? How? what are the challenges? How to overcome those challenges?
Starting with the bread-and-butter documents, documents that need to be maintained within a project anyway are a good means of starting to use wiki. Evolving these documents in a Wiki instead of a word document is a quick win and will show the team the power of Wiki….
Things like project overview, roles & responsibility, infrastructure details, release & build processes, tips & tricks, Faqs, what to when.. etc etc..