Almost three years ago I posted an entry entitled Safe Browsing and URL Forwarding in which I described how labeled web browsers could be launched at the label corresponding to the web site. Now BlueSpace has extended that concept in a new product called BlueSpace Multilevel Search and Share (S2). Using their Trusted Service Bus, Trusted Extensions, and Google's enterprise search appliance, they are able to aggregate the search results from multiple labeled networks, without upgrading the data. Search results are labeled according to the network on which they were found. Clicking on a link opens up a browser in a labeled zone corresponding to the label of the data. Using this approach, avoids the problems associated with moving or elevating data between classified networks using guards or proxies.
Here is a link to their press release describing the work in progress.