First: It'd be nice to drop us a comment via IRC/eMail if you download this via Mininova, so I know if multi-tracking is worth the effort and will distribute the next snapshots and even formal releases here, too.
The actual compile date of the content is 2009-04-17 for sparc, 2009-04-24 for i386, 2009-04-25 for everything else.
This is a combined Live and Installation CD ISO image (gzip'd) of the operating system MirOS BSD (www.mirbsd.org), which is similar to the more popular GNU/Linux in that it's free and how it looks, but inherits some 30+ years of UNIX? tradition. It’s called a Triforce CD because it contains DuaLive™ technology (i386 Live CD, i386 Install CD, sparc Install CD) as well as MirGRML 2009.01 as a “rescue system” bonus.
The image supports the more popular i386 architecture (32-bit, Intel 80486DX CPU, or 80486SX CPU + 80487 FPU, and up, and it will also run on some amd64 systems) target with Live CD and Install CD features, as well as the 32-bit sparc architecture (sun4c, sun4m) with V8 CPUs as an Install CD only. (Support for 80386 and sparc-V7 can be arranged by recompiling the source code.)
This is probably not for "newbies" because it's a purely text-based installation; the graphical user interface must be set up afterwards. However, the Live CD functionality boots into XFree86? (although it's quite slow, because everything is read from CD-R), so you can use it to have a quick look into the system's default configuration, which can be extended by additional packages after installation. It's also great as a rescue CD.
This is a full-fledged BSD Unix Operating System (Live CD, but you can also install from it), but not the usual beginner-friendly flavour. Instead, it tries to bring power to the power user, be highly performant, configurable, very secure, etc. but remember this is only a development snapshot, so it's still possibly of beta quality. If you discover bugs, please report them back.
Also included is the full build log (compilation commands), hashes and checksums of the files (i.e. the ISO image, install sets, ...) and is digitally signed using GnuPG as a courtesy to the reader and using http://www.mirbsd.org/man1/gzsig.htm like all our releases. There is also a Mini-ISO which configures the bootloader and kernel to use a serial console at COM1: with 9600, 38400, or 115200 bps and 8 data bits, no parity, 1 stop bit. (This is for i386 only, because on sparc, the OpenBOOT firmware handles the console.) They are “hidden” in /v10/i386/ inside the ISO 9660 filesystem image. There are also appropriately patched floppy images.
Does not contain a tarball of NetBSD? pkgsrc? with modifications to work with MirOS BSD as well. The reason for this is lacking cooperation of that projects' developers. But the situation recently begun to improve, so maybe next time again.
See http://www.mirbsd.org/MirOS/PR/flyer_en.pdf for a first impression.
How to use it
Get gzip and use it to decompress the ISO file (WinZip® should do fine too). Either burn it to a CD-R(W) or run it from an emulator (qemu, VirtualBox OSE, vmware, bochs, Parallels Desktop, ...). The checksum file is gzipped and OpenPGP signed and contains SFV/CRC32 checksums as well as cryptographic quality hashes for the files.
Note that some VirtualBox versions are known to have issues with non-Windows, non-Linux guest OSes. Parallels Desktop and qemu are known to be fine, although the coloured boot menu looks weird in Parallels. VMware Server 2.0 Beta is perfect, they have improved a lot, especially regarding timekeeping. Qemu 0.9.1 seems to have issues sometimes, 0.7.2 (with or without recent(!) kqemu) and 0.10.1/2 work fine.
Documentation is, admittedly not very much, at http://mirbsd.de/ and http://www.mirbsd.org/ - in addition, much of the documentation for OpenBSD still applies.
Read http://www.mirbsd.org/man7/install.i386 and http://www.mirbsd.org/man7/install.sparc as well.
For MirGRML, http://grml.org/ is upstream. Note that this version is adapted to our needs, e.g. runs mksh instead of zsh by default.