We want it to be easy for people to become involved in the development of NetBSD. Distributing the current development sources makes becoming involved easier, because it allows a greater number of people to see where the system is going. It also makes changes from users easier to integrate; if users make changes against the current development sources, then virtually no integration is needed to get them into the master source tree.
We also want people to test the software as we're developing it. Users of NetBSD-current are encouraged to send in bug reports about the current sources, and that helps us find and fix bugs. Because people are testing the software soon after it's written, more bugs can be found and eliminated.
People who use NetBSD-current may also want to find out the state of the bug reports. This allows a user to track the progress of a bug report they submitted or even look for bugs to fix.
If you're really interested, NetBSD-current is available via anonymous FTP and SUP. Current sources can be found in the NetBSD-current area directly off the ``root'' of the NetBSD area on FTP mirrors. NetBSD-current has it's own set of SUP collections, but those collections may differ from one SUP server to another; see the indivual servers' README files for more information.
People using NetBSD-current are strongly encouraged to subscribe to the current-users mailing list. The source-changes mailing list is also of interest to users of NetBSD-current.