netselect -- Choose the fastest server automatically
http://apt4rpm.sourceforge.net
This is netselect, an ultrafast intelligent parallelizing binary-search
implementation of "ping." You give it a (possibly very long) list of
servers, and it chooses the fastest/closest one automatically. It's good
for finding the fastest ftp.debian.org mirror, the least laggy IRC server,
or the best Squid neighbour.