Stefano just posted this on the Freebase developers mailing list, and I thought it warranted a repost here on the blog.

One of the interesting pieces of the Freebase dataset that not many people know about is the fact that when we harvest or link data from various sources, we retain their original identifiers and also the uri_templates that we can use to remap those local identifiers back to worldwide web identifiers.

Since this is a very useful feature, I’ve spent a little time to make this information easier to use and create an Acre app that is capable of taking either a freebase id and return all the equivalent URIs for that concept or get a URI and try to find all the equivalent URIs.

NOTE: The service is powered by both Freebase and SameAs

It also offers a JSONP service so that you can access it from your own web pages if you need to do so.

Find it at: http://ids.freebaseapps.com/