The most current version of weighbor is generally at
<a href="http://hal.rockefeller.edu/Research/nds/Weighbor/">
Nick Socci's weighbor page</a>.  This is the official
version 1.2, including source code and selected executables.
More executables are on the way...
<p>
If the above link does not work for any reason, please
try
<a href="weighbor.tar.gz"> the local tar file</a> or
<a href="http://dnamining.com/science/weighbor/weighbor.tar.gz"> the
copy at DNA Mining</a>.