CTAN has a new package: pgf-umlsd

[CTAN Announcements]

This should be at your local mirror within a day.

Thanks again,
Jim Hef{}feron
Saint Michael's College

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The following information was provided by our fellow contributor:

Name of contribution: pgf-umlsd
Version number: 0.5
Author's name: Xu, Yuan 
Summary description: Some LaTeX macros for UML Sequence Diagrams.
License type: gpl

Announcement text: 
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Some LaTeX macros for UML Sequence Diagrams.
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This package is located at 
   http://tug.ctan.org/tex-archive/graphics/pgf/contrib/pgf-umlsd
.  More information is at
   http://tug.ctan.org/pkg/pgf-umlsd
(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 .