eCryptfs is a POSIX-compliant enterprise-class stacked cryptographic filesystem for Linux. You can use it to encrypt partitions and also directories that don't use a partition of their own, no matter the underlying filesystem, partition type, etc. This tutorial shows how to use eCryptfs to encrypt a directory on Debian Squeeze.

http://www.howtoforge.com/how-to-encrypt-directories-partitions-with-ecryptfs-on-debian-squeeze

Recently at, we’ve been setting up several new instances of OpenERP for customers. Our server operating system of choice is Ubuntu 10.04 LTS. Installing OpenERP isn’t really that hard, but having seen several other "How Tos" online describing various methods where none seemed to do the whole thing in what I consider to be "the right way", I thought I’d explain how we do it. There are a few forum posts that I’ve come across where the advice is just plain wrong too, so do be careful.

http://www.howtoforge.com/how-to-install-openerp-6-on-ubuntu-10.04-lts-server

Mailman is an open-source mailing list manager, i.e., it can be used to manage email discussions and newsletter lists. It is probably the most popular and widely used mailing list manager on the Internet. This tutorial explains how to install and configure Mailman on a Debian Squeeze server with a Postfix mail server.

http://www.howtoforge.com/how-to-install-and-configure-mailman-with-postfix-on-debian-squeeze