Just a few ideas.... So simple it's silly.. but ...

Birth certificate.
Medical card for transfer of medical history.
Any other state documents they have there..i don't know what they might be.

all your love letters so her family can't read and laugh...hehehehe

Education ceritificates, Employment history.
Names addresses and tel no.s of previous employers for reference purposes.
Any bank account details.
Any bills or statements showing previous address.

And anything else you can think of.

I've moved around a bit and I always try to take as much of this lot as I can. You never know when you're going to be half way round the world and realise you left your original birth certificate in a box in your parents loft and all you have is a certified copy...(like i've gone and done) Inlcuding my bank statements which would have allowed me to open an account here in Hong Kong right away.. but now I gotta wait for them to come through the post...

ho hum... such is life.

good luck. Hope you're both very happy.
take care