DShield.org is an attempt to collect data about cracker activity from all over the internet. This data will be cataloged and summarized. It can be used to discover trends in activity and prepare better firewall rules.
Right now, the system is tailored to simple packet filters. As firewall systems that produce easy to parse packet filter logs are now available for most operating systems, this data can be submitted and used without much effort.
More complex patterns, such as are used by application level firewalls may be handled in the future.
DShield provides a platform for users of firewalls to share intrusion information. DShield is a free and open service.
If you use a firewall, please submit your logs to the DShield database. You may either download one of their ready to go client programs, or use their Web Interface to manually submit your firewall logs. Registration is encouraged, but is not required.
Everybody is welcome to use the information in the DShield reports and database summaries to protect their network from intrusion attempts.
More information about how DShield works is on their home page.