Killer Feature #2 for you ESL folks...
You can actually mix alignments within a paragraph! MS Word requires a carriage-return to change the section justification (i.e. - left, center, right) but OO allows you to do it with a tab (ASCII 9) character.
This is a killa feecha for marginal notes, witness my Henry V, available in either OpenOffice [link|http://www.semishake.org/Texts/HenryV/HenryV.sxw|SXW] format (85 K), or a [link|http://www.semishake.org/Texts/HenryV/HenryV.pdf|PDF] (735 K) made from that document (if you don't already have OO). I can actually right-justify the marginal notes without a separate column!
Amazing.