*Remember to restart spamassassin after all of this.

DCC

wget http://www.dcc-servers.net/dcc/source/dcc.tar.Z
tar -zxvf dcc.tar.Z
cd dcc-1.3.138/
./configure;make;make install

#enable DCC, uncomment the line that disables it near the top
vi /etc/mail/spamassassin/v310.pre

pyzor
wget http://sourceforge.net/projects/pyzor/files/pyzor/0.5.0/pyzor-0.5.0.tar.gz/download
tar -zxvf pyzor-0.5.0.tar.gz
cd pyzor-0.5.0
python setup.py build
python setup.py install

chmod -R a+rX /usr/share/doc/pyzor \
                /usr/lib/python2.4/site-packages/pyzor \
                /usr/bin/pyzor /usr/bin/pyzord

change the "python2.4" path as necessary if you have a different python version.