Searching http://www.bing.com/search?q=donald+knuth, I see the freebase integration, but I don't see anything other than search results and ads at the bottom of the page. What am I looking for?
I would say that's Powerset's technology merged into Bing, not direct Freebase.
If you want a more practical application for Trinity look at http://research.microsoft.com/probase/ (linked at the bottom of the page). Also to quote the page:
Microsoft Bing’s AEther project now uses Trinity for managing AEther’s experimental data,
which consists of large number of workflows, and the evolutions among the workflows.
Trinity is the backend graph storage engine of AEther's workflow management system.
We are adding more functionalities, in particular,
subgraph matching and frequent subgraph mining, to support the project.
