I have not done anything like that per se. Except via the obvious, that I expect you have already looked at, like the company intranet / newsletter and via the internal management structure.
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They key to adoption I have found is creating dashboards that people need and want to use. Especially if it shows KPI's that their performance shall be measured against and then drills down to the transactional business data that was consolidated to calculate those KPI's. Such dashboards, once over the initial hurdle, acquire internal organic growth via the intangible "word of mouth". People generally use and search for things that help them achieve their KPI's.
Also I remember things that nobody wanted - usually because nobody had any real need for them. - and avoid things that previously failed. But occasionally people were simply not ready for them before, but now could be.
