I was just reminded today of, for example:

Very useful for looking up a Dewey call number and finding out what it's 
about. (You can get it in RDF, too.)

Are there plans to do something similar with the Library of Congress 
Classification?  I hope this is the right place to ask.  I'm working on 
something that's generating lots of call numbers, like E 99 and PS 3545 and BX 
4705, and I would like a URL that would tell me what they are. (Or as close as 
is possible.)

Is anything like that in the works?  It would be amazingly useful service, even 
just a simple lookup without the full complexity of LCC.

William Denton, Toronto :