PLF stands for Penguin Liberation Front. These packages are ones that didn't make it into the distribution's download version for licencing or other reasons. There are some great things there. Go to
Easyurpmi and set up a good urpmi sources list. You'll be amazed at how many packages there are out there. Did you know there is a Mac emulator out there? Did you know there was an internet radio streamer for Linux? A professional quality film-editing software? Manuals in html for your hard drive? An actual rpm for mplayer that fetches the win32 codecs by default? Tee hee. And more!
