CTAN has a new package: fouridx

[CTAN Announcements]

The package below has been installed at tug.ctan.org and should soon be
at your favorite mirror.

Thanks again,
Jim Hefferon
Saint Michael's College

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The following information was provided by our fellow contributor:

Name of contribution: fouridx
Author's name: Stefan Karrmann
Location on CTAN: /macros/latex/contrib/fouridx
Summary description: An alternative to \sideset and \leftidx.
License type: lppl

Announcement text: 
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This package enables left subscripts and superscripts in math mode.
These subscripts and superscripts are automatically raised for better
fitting to the symbol they belong to. This is done in such a way that
the left and right subscripts and superscripts are set on the same line,
respectivly.
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This package is located at 
   http://tug.ctan.org/tex-archive/macros/latex/contrib/fouridx
.  More information is at
   http://tug.ctan.org/pkg/fouridx
(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 .