I've used Open Office for quite a while now and always been frustrated with the fact that I didn't know how to do a different header on the first page. Since I have not had to use this personally it hasn't been a big deal. Now my wife is taking a writing class needs to be able to do this so I finally started trying to figure it out. Enough of the preamble.
I discovered that it is really pretty simple. Go to the first page of you document and bring up the styles (press F11) and then find the page styles lists and select "First Page." That's even easier than when using MS Word. The only issue now is that the feature does not apply when saving as a Word document.