Almost all the major Linux distributions are using LibreOffice instead of OpenOffice. Today, it has been announced that Debian Squeeze too will get LibreOffice in the backports.
LibreOffice has been available in Debian Wheezy and Debian Sid for a while now. But in the stable release, Debian Squeeze, it is not available. As a Debian policy, new packages are never introduced in the core repository of a stable release. So, it is very unlikely that Debian Squeeze will ever get LibreOffice in its main repository.
So, users of Debian Squeeze who wanted LibreOffice will have to install it from either the unstable or testing archive. However, Debian Squeeze users will no longer have to do that as LibreOffice has been made available in the Squeeze Backports.
How to install LibreOffice in Debian Squeeze from backports
Note: Installing LibreOffice will remove OpenOffice.
To install LibreOffice from the Squeeze backports, you need to add the backports first. To do that open the Terminal and execute:
$ sudo vi /etc/apt/sources.list
Now add the line given below and save the file.
# deb http://backports.debian.org/debian-backports squeeze-backports main
Now update the software list.
$ sudo apt-get update
Finally install LibreOffice with the command
$ apt-get t squeeze-backports install libreoffice