Manders,
Some of the things I did before I moved to Hong Kong ... which in a way helped break the ice with a lot of colleagues and their friends. Some random thoughts...
-- Watched every Hong Kong movie I could get my hands on. Oldies from John Woo / Chow Yun Fat etc. Great conversation starters with a lot of people.
-- Read a ton of fiction based around Hong Kong.
-- Spent a ton of time at my local chinese take away as I was told that "you're not going to get this food in Hong Kong"! We still hit the Chinese takeouts in London / North America when we're visiting those places.
Overall, keep an open mind. In many ways HK is a far more dynamic and vibrant place than most western cities (I spent way too much time around the mid-west). I've generally found HK to be one of the better places in Asia in terms of making friends, meeting people, doing business and ummm.. enjoying life. (I am not usually this cheerful about things, I'm usually a cynical bastard).
There is a tendancy for north-americans (less so amongst candians) to err ... look down upon the local and all things chinese. The culture is different, the road to sucess is different and the value systems are different. They may be wrong in your eyes, but in a Zen / Confucian / Pure Greed system of life, they may not.
There are plenty of networking groups in Hong Kong. Something that may be alien to most north americans. You'll find the Can Cham, AmCham and YPC (Young Professionals Committee(?)) great places to meet and mingle with fellow expats.
Also, I'd recommend taking a look at
http://www.bigwhiteguy.com He's a brilliant writer who in has the ability to put into words what many of us think about Hong Kong and life here.