Handle content-negotiation

[Phyks]

To provide a real alternative, outputting bibtex for citations and such things as well.

I can handle it.

[wetneb]

I guess the simplest way is simply to redirect to http://dx.doi.org/ if a fancy "Accept" header is set?

[Phyks]

Sure. But would be cool to rebuild a BibTeX entry to cite the openaccess version of the article, like the arXiv version, rather than the published one.