CTAN has a new package: doi

[CTAN Announcements]

A new package has been installed on tug.ctan.org and should soon be at your
favorite mirror.

Thanks,
Jim Hefferon
Saint Michael's College

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The following information was provided by our fellow contributor:
Name of contribution: doi
Author's name: Maarten Sneep
Location on CTAN: /macros/latex/contrib/doi
Summary description: Ensure correct hyperlinks to dx.doi.org
License type: lppl

Announcement text: 
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You can hyperling DOI numbers to dx.doi.org. Some publishers have 
elected to use some nasty characters in their doi numbering scheme 
(<, >, ; have all been spotted). This will either upset (La)TeX, or 
your pdf reader. This style file contains a single user-level command 
\doi{}, which takes a doi number, and creates a hyperlink from it.
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This package is located at 
   http://tug.ctan.org/tex-archive/macros/latex/contrib/doi
.  More information is at
   http://tug.ctan.org/cgi-bin/ctanPackageInformation.py?id=doi
(if the package is new it may take a day for that information to 
appear).  We are supported by the TeX Users Group http://www.tug.org .  
Please join a users group; see http://www.tug.org/usergroups.html .