I have to say I have been using OpenOffice/LibreOffice for the past 4 months on my office Windows XP machine for the last 3 months and have not needed Microsoft Office at all. It's nice to know that their good work is continuing.
I am a good couple years into using OOo and I am yet to miss Office.
If, for no other reason, if your company standardizes on OOo, nobody will sneak a SharePoint server into your organization ;-)
I've been using SoftMaker Office 2008 for the past 2 months and can't believe how much faster it is than OpenOffice, which is a shame, because I've been using OO for years.
Phoronix is terrible, please use other sources if available. http://h-online.com is a good alternative for release overviews, etc.