A good friend of mine (he's European) is in love with a Cambodian girl
and will soon marry her. Since I've been invited to his wedding, I
want to know more about the traditional Cambodian marriage. In order
to avoid making a blunder, I wish to know how I should address her
family. What are the do's and don't's? What kind of gifts should I
make?
I think it might be a nice idea to drop a line in Khmer wishing them
good luck for their wedding and for their future together. Could you
please provide me a short text in Khmer (with phonetics) for the
greetings card, which I could copy by hand? I think my computer can't
read Khmer characters, I therefore may need a link to a picture of the
translation (unless you can explain me how to install the Khmer
character set - I'm using Win XP).

Just be nice and respect them and their culture and follow others. You
will be OK. Come to think about it you will be more than ok. As
humanbeings we all respect others who respect us.

Hi, I've been to Cambodia (adopted a son and also have an adopted
Cambodian sister) and have some tips.  Cambodians typically greet each
other with hands in the prayer position and bowing their heads
slightly.  Sometimes men will shake hands.  Women mostly stick with
the traditional greeting.

When giving a gift, always hand it to the person with your right hand.
 Also, if you want to be extra polite, hold your right elbow with your
left fingers while handing the gift.  Cambodians are very well known
for their beautiful fabrics.  For small gifts I would recommend giving
fabrics (possibly scarves) that are beautiful and vibrant, jewelry
(handcrafted) or hand-carved wooden sculptures, bowls, boxes, etc.

Don't worry about making a mistake.  The Cambodian people are very
loving and happy, in general.  Two taboos though are patting a
Cambodian child on the head and motioning for a Cambodian to "come
here" (they consider this sexually suggestive).

Good luck to you and the happy couple!