I like to use PPMd (via 7zip) for large volumes of text, but it seems to only be single-threaded, which is a shame. It cuts a good 30% again off the size of the

I like to use PPMd (via 7zip) for large volumes of text, but it seems to only be single-threaded, which is a shame. It cuts a good 30% again off the size of the .xml.bz2's that Wikipedia provides.