There are currently several groups working on Linux for the PowerPC.
 
MkLinux is a Linux server (user-mode process) running on top of an Open
Software Foundation Mach microkernel. Apple's paying the bill, and Apple and
The Open Group engineers together are doing the port. The mklinux web 
site is at: http://www.mklinux.apple.com/ 
 
LinuxPPC is a monolithic Linux kernel (like traditional Linux is on
Intel, SPARC, and Alpha hardware) ported by Paul Mackerras to PCI Macs, Cort
Dougan for other PPC platforms.
 
LinuxPPC and MkLinux do share a common bond.  The binary applications are
compatable between systems.  A good place to look for applications is:
http://www.linuxppc.org/
This is the linux-ppc website. You can often find precompiled binaries there
that will work on one of the Mac Linuxes. http://www.LinuxPPC.com is the 
"commercial" side of the www.linuxppc.org website.

http://www.yellowdoglinux.com/ydl_home.html Is the address for yet another 
Linux distribution that will run on PowerPC computers. 

There's also a port by Debian (http://www.debian.org/ports/powerpc/ )

And there is still another distribution by Turbo Linux 
http://web1.turbolinux.com/ppc/
 
In summary: If you own a PCI Mac, you can choose between MkLinux, LinuxPPC
Yellow Dog Linux, Debian, or TurboLinux. If you have a NuBus Mac, MkLinux is 
the only Linux that even has a chance of working. If you have a non-Mac 
PowerPC box, you should look at LinuxPPC.
 
This FAQ-O-Matic is dedicated mainly to both MkLinux and LinuxPPC, since they 
are the oldest and most distributed versions, and once you've gotten a kernel
running, many things (including almost every binary) work interchangeably 
between versions. Though this is subject to change...
 
1-30-97 written by jonh@cs.dartmouth.edu.
7-10-97 pmitros@mit.edu added mklinux link
9-24-99 Edited to reflect more recent distributions and links inet2@akos.net