The arXiv site translator works great. However, as a particle physicist, i'm using spires ( http://www.slac.stanford.edu/spires/ ) for bibliographical information. This database keeps the most complete list of articles published in high energy physics. It also provides a bibtex entry for each article, which, apart from the arXiv identifier, also has the full journal info (and a citation key).
It would be great if zotero could handle that!
josef