For any HN'ers based in London the British Library in St Pancras is a fantastic resource, and their Business and IP Centre ( http://www.bl.uk/bipc/ ) has an easy signup for a Readers Pass for entrepreneurs.
The equivalent would be if Starbucks, the coffee shop, only served inferior quality coffee at a ridiculously high price … wait a minute …
I'm not sure it's really an appropriate place for entrepreneurs unless they are interested in accessing or using the books somehow. When all the other libraries have shut down or turned into Internet access centers, this one will still be valuable as a repository of the books we choose to keep as physical artefacts.