The publisher Elsevier have a wiki-like, knowledge-sharing website for the scientific community : SciTopics
SciTopics provides a concise summary of a specific scientific topic, which is especially useful for topics outside your area of expertise.
The subjects covered include Business, Management and Accounting and Economics, Econometrics and Finance including further sub-divisions of those subjects. All content is by invited authors with strict editorial control. You can subscribe to various RSS feeds for updates.