From Wikipedia:
Black Lab Linux was a free software, open-source Linux distribution for Power Architecture hardware. It was first released in 1999 for the Apple Macintosh as a product of Terra Soft Solutions, a Colorado (USA)-based software company specializing in Linux on the Power Architecture. Black Lab Linux was a variant of Yellow Dog Linux tailored both for embedded systems development and for high-performance, parallel computing. It focussed exclusively on the Apple PowerPC and IBM RS/6000 hardware platforms Black Lab Linux became an enhancement CD providing developer tools for Yellow Dog Linux customers, then was completely merged into Yellow Dog Linux.
I ask because there is now a Xubuntu-based distribution calling itself "Black Lab Linux", as seen at http://www.os4online.com/. It's previous name was OS/4 OpenLinux (no relation to OS/2, AmigaOS 4, or Caldera OpenLinux), hence its current URL, but, based on what was said in their November podcast, they plan on changing their URL to blacklablinux.org to reflect the name change. The websites for Terra Soft's Black Lab Linux were blacklablinux.com and www.terrasoftsolutions.com/products/blacklab/.
This distribution's logo (as seen on its Facebook page – https://www.facebook.com/os4online ) also bears some similarity to YDL's logo.
"Black Lab Linux": YDL:
They even use the old Terra Soft Black Lab Linux logo on their SourceForge pages.
http://sourceforge.net/projects/os4online/
http://sourceforge.net/projects/blablinux/
"Black Lab Linux" development screenshot: