plzip : parallel lossless data compressor based on the lzlib compression library ( http://lzip.nongnu.org/plzip.html )
pxz : Parallel implementation of the XZ compression utility ( http://jnovy.fedorapeople.org/pxz/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a OSSDL
For Paludis use this rsync : rsync://gentoo.zugaina.org/OSSDL-portage
If you have a problem : ycarus(-at-)zugaina.org