On the iSpecies blog Rod Page describes how he extracts DOIs from Google Scholar results - he does use the Crossref OpenURL interface and Connotea to get DOIs too. He also says “DOIs are pretty cool” which is good! On another blog post to SemAnt Page describes how he uses LSIDs and DOIs for Ant literature. It seems that there is more and more of this type of use of the DOI so its great we have the OpenURL interface.