Resumes shouldn't be longer than one page and as accessible as possible
so that whatever the potential employer is using will work, of course!
Invoices are a good thing to do simply as well as getting paid is more
important than beating one's technical chest with a complicated document
that only works if you have MS Office.
Some people have enough skills and history that is relevant to a job
that 2 pages are necessary and acceptable. A single page resume might be
fine for a grocery bagger, but a stock trader, a electrical engineer, a
network engineer, a doctor....
Now, if I take my information and format it in tables on the sheet, so
that everything lines up in good form, with plenty of whitespace to make
it easy to read, with the tables not visible, they will not properly
convert when opened in OO.
So, as always, OO is fine, in fact it's great, provided you don't have
to interface with MS Office documents and pass them back and forth
without a format/rule change.