I read this article:
http://www.robweir.com/blog/2006/08/...l-and-odf.html
I also tried OOLatex extension.
Former is good in the fact that i can edit the formula after inserting it into the document. Latter is good in that i don't have to ZIP/UnZIP anything to insert the formula.
Actual question: how can i (if i can) paste (import, etc.) MathML expression into OpenOffice document so that i can edit it afterwards, and so that i don't have to hack into the document file?