The latest version of NetBSD - 1.6.1 - has been released on April 21, 2003.
NetBSD 1.6.1 is a maintenance release for users of NetBSD 1.6 which provides the following updates relative to 1.6:
* A number of security issues have been fixed.
* Some performance fixes have been incorporated.
* Improved device support in some existing drivers.
* Some new device drivers have been added.
* The evbsh3 port has been added to the binary distribution.
* Some minor userland fixes have been applied.
A more complete Release Announcement can be found here: http://netbsd.org/Releases/formal-1.6/NetBSD-1.6.1.html