I stumbled upon portable apps on the weekend and I think it's a great idea. I also wish I had found it earlier; could have been very usesul as a computer science student working in the school labs (I graduate in a few weeks, haha). Anywho, onto the point.
I have been using Office 2007 and have documents saved in the native .docx format. However, the current open office does not support it. After searching, I couldn't find a standard 'filter' or plug-in to facilitate opening these files. I did, however, discover that Novell has their own release of Open Office, and they've created a filter that allows opening of .docx files. I haven't fully tested it; I just opened a document or two and it worked. So, I wanted to point it out. I didn't want to provide a direct link to it, incase I accidentally violated a rule (unwritten or not), but if it's acceptable to share this (I'm 99.99% sure that it's free to distribute, given that it's a modification of an open source program, but I'm still new to open-source) then I'll post it!