First of all: This is a Slackware forum. The Slamd64 forums are here:
http://forums.slamd64.com/. You should post questions about Slamd64 there.
To answer your question: I haven't installed OpenOffice.org on Slamd64, and I am not aware of any 64-bit packages of OO.o for Slamd64. But you as far as I know the 32-bit version runs quite well on it. For Slackware 12.0 I usually recommend to use one of these:
If you want the US-English version:
http://www.slackbuilds.org/repositor...penoffice.org/
If you need some other language, the by far easiest way to install OO.o on Slackware is this:
http://www.slacky.eu/index.php?optio...4358&Itemid=56
These are Slackware packages, but I am confident that they will work either out of the box or with only a little bit of tweaking on Slamd64 as well.
Have fun!
gargamel