The Astrometry.net team has taken over hosting and maintenance of the pylevmar package (as of Feb 2009), a small Python wrapper for the levmar Levenberg-Marquardt implementation by Manolis Lourakis. pylevmar was originally written by Alastair Tse.
We are currently not packaging releases of the code. Instead, you can grab the current development version with the following command:
svn co http://astrometry.net/svn/trunk/projects/pylevmar
pylevmar is a work-in-progress; if it does not implement some part of levmar you need, or you find bugs, please send an email to dstn.