Logwatch is very simple to install on CentOS boxen:

yum -y install logwatch

This will install logwatch and configure the daily logwatch cron in /etc/cron.daily. If you want to customize your logwatch configuration, you can edit /etc/logwatch/conf/logwatch.conf and modify settings like the email address the report is sent to, the verbosity of the report, what day you want logwatch to process, etc. A sample configuration is located at /usr/share/logwatch/default.conf/logwatch.conf