A general counsel who subscribes pointed me to Knowledge Mosaic. Its website proclaims that subscribers can search more than 90,000 memos from law firms covering 46 different practice areas. If true, that is an astounding collection of legal guidance and interpretation available on the Internet, albeit for a subscription fee. At some point, that wealth of knowledge will be no cost (See my post of Nov. 26, 2011: availability of information at low cost or free on the internet that is useful to in-house counsel.).
Knowledge Mosaic has also collected laws, rules and regulations pertaining to more than two dozen federal regulatory or oversight agencies, along with material from the U.S. Code and the Code of Federal Regulations. Both of these collections, as well as other materials mentioned on the site, look to be useful for inside counsel and a good example of legal knowledge aggregation and organization.