The Sahana Software Foundation has responded to the recent floods in Pakistan through providing a public portal of its Sahana Eden software. Located at http://pakistan.sahanafoundation.org, the site was designed to track situation reports collected from aid agencies working in Pakistan and is initially focused on the many flood assessment reports being reported by such agencies as the UN World Food Programme.
Sahana is working with Crisis Commons and Open Street Maps on providing support for data collection and mapping data.
If you are interested in supporting these efforts, please visit the #sahana-eden chat room on irc.freenode.net.