The FreeBSD bugbusting team is coordinating a network bugathon, which will be held from 2009-01-30 to 2009-02-01 (Fri-Sun). The plan is to work through all network related PRs still open in GNATS. Everyone is welcome to join and help this effort.
Lots of more information is available on the FreeBSD wiki: http://wiki.freebsd.org/Bugathons/January2009
IRC channel where all the fun stuff will happen: #freebsd-bugbusters on EFNet
Source: FreeBSD Forums