The networking subsystem now knows about cloning interfaces. This allows to have a variable number of instances of a certain device, and extending it doesn't require a kernel-rebuild and reboot. Use "ifconfig -C" for a list of devices that support cloning in 1.5.1.
New and improved drivers include a driver for the Aironet/Cisco wireless PCMCIA cards, an(4), the NCR siop(4) driver was enhanced for performance and stability, the isp(4) driver now works on MacPPC and other big endian ports, the VIA chipsets now do Ultra/66 DMA, and several pciide controllers now run up to Ultra/100. Support for Intel 82801BAM controllers has also been added, and handling of Ali controllers has been improved. The ex(4) driver now supports the 3COM 3c555, 3c556 and 3c556B MiniPCI Ethernet cards, and drivers for the Apple PowerMacs' audio hardware, the Accton EN2242 and other AmdTek AN985 cards and for sound cards based on Yamaha YMF724/740/744/745, ESS Technology Maestro 1, 2 and 2E, NeoMagick 256 and Cirrus Logic CrystalClear PCI Audio CS4281 were added.
Upgraded software include BIND 8.2.3 (see Security Advisory SA2001-001), OpenSSH is at 2.5.1 (see SA2001-003), sendmail is at 8.11.3, ISC DHCP V3 beta2 patchlevel 23, Heimdal kerberos 0.3e and probably some others that I forgot about.
Other security related updates were done to ftp(8) per SA2000-018 and SA2001-005, ntpd(8) per SA2001-004, telnetd(8) per SA2000-017 as well as a on i386 a kernel fix related to USER_LDT that's documented in SA2001-002.
Binary packages build on and for NetBSD 1.5.1 are available on ftp.netbsd.org in the /pub/NetBSD/packages dir, and there are also several ISOs that have the binary pkgs available for download. Thanks go to Dan McMahill here for his 'cdpack' program that helps in putting binary pkgs on CDs so that each CD has all the dependencies. The result is three fully packed CDs for i386, and probably not much less for other architectures.
With NetBSD 1.5.1, yuo can now experience NetBSD, KDE2 and KOffice for a fully integrated office environment with no license problems. Available for i386, alpha and many other architectures. Mozilla 0.9, KDE 2's Konqueror and Links 0.95 are just a few examples for browsers available to explore the Internet with NetBSD. A support package for running VMware on NetBSD/i386 was added, it's called suse_vmware. The official VMware code, a valid license and Wasabi Systems' compat package are still needed.
Other highlights of the pkgsrc and binary pkgs that are available for NetBSD 1.5.1 include: Apache 1.3.19 and 2.0.16, BIND 4.9.8/8.2.3/9.1.2, Civilisation Call To Power (demo version), Ghostscript 6.01, GNOME 1.4.0, GNU Emacs 20.7, Heretic 2 (demo version), Sun's JDK & JRE 184.108.40.206, KDE 1.1.2/2.1, Mozilla 0.9, perl-5.6.0, Perl 5.6.0 with many modules, Quake3-Arena (demo version), Samba 2.0.9, teTeX 1.0.7, Xemacs 21.1.14.
As a result of this, NetBSD ships the "old" XFree 3.3.6 from xsrc by default, but also includes a binary snapshot of the new XFree 4.x line so people using recent graphics cards can use that for NetBSD. The sources for the latter can be found in xsrc/xfree, and everyone interrested in rebuilding XFree 4 can do so after putting USE_XF86_4=yes into /etc/mk.conf.
To install the XFree 4 shapshot that comes with NetBSD 1.5.1, move aside /usr/X11R6 and extract the tarball in /. Then run 'xf86cfg' to configure X.