Last year Adam and I got into Hong Kong movies heavily and in a year's time I've amassed tons of movies and have seen almost all of them ^_^. Just as American cinema spans every genre, so does Hong Kong cinema. It's not all Crounching Tiger or Iron Monkey though that's about the only thing that ever makes it over here to America -_-. Well that being said, most people are missing out on the genius that is Hong Kong cinema and some of my favorite actors like Stephen Chow, Andy Lau, Jakie Chan, Ekin Cheng and Nick Cheung.
Here's a quick rundown of a few must-see movies though there's plenty more if you ask ^_^
Shaolin Soccer
The Legend of Speed
Gen-X Cops/Gen-Y Cops
The Duel
The God of Cookery
The Accidental Spy
You Shoot, I Shoot
Love on a Diet
The Conman Trilogy (99, in Vegas, in Tokyo)
The God of Gamblers
2002
Fulltime Killer
The Legend of Zu
Young & Dangerous

...plus more, just ask heh