Hi. Libre Office is in squeeze-backports and wheezy + other dangerous places...

To access squeeze-backports, edit your file /etc/apt/sources.list by adding the line

deb http://www.backports.org/debian squeeze-backports main contrib non-free

Then fire up Synaptic Pkg Mg and do a search on libreoffice

I havn't downloaded it but I'd be interested in knowing how it compares to OO.