HN user
There's also lang-8.com, where you can get your essays corrected by native speakers. It's particularly great if you're learning Japanese, because the majority of users are Japanese natives (the company that runs the website is in Tokyo).
"My 5000 word assessment of (insert latest gadget here) that leaves no doubt about why absolutely (no-one|everyone) should buy this, conveniently ignoring that other geeks have their own opinion and the average user doesn't give a damn"
"10 mistakes that I made during my unsuccessful YC interview, 9 of which PG probably didn't even notice"
"Show HN: My first (read: I'm younger than you) app I hacked up in less than 20 mins (read: I'm smarter than you), because I had nothing else to do (read: don't feel too cozy in your job, cuz I'm dropping out of college any day [if my parents agree, that is])"
"How I made big bucks with something so trivial that I'm surprised my cleaning lady did not think of it before me"
"Apple is no longer as innovative as they were 5 minutes ago"
Plenty of discussions that mix a lot of fancy Latin expressions and Scotsmen
Recruiter: a derogatory term for somebody that knows less about a specific field than than the experts in that field they hire
Fanboy: favoriteGadget.brand != other.favoriteGadget.brand
Fanboy of a Recruiter: greatest insult on HN
A cursory search turned up this thread CSDN => http://bbs.csdn.net/topics/370249613 (CSDN being a popular IT forum in China - another one that you may want to research is iteye.com).
According to the author, paid apps are hard to make money off. It appears advertising is the easiest way to monetize apps. Post '#2' has a list of ad networks. Post '#28' enumerates popular Android markets.
As for your second question, it is probably no problem. You just need to sign up with one of the many Chinese equivalents of Paypal. I'm sure there are then ways you can get the funds transferred to your account.
US: kitchit.com, munchery.com, kitchensurfing.com
UK: housebites.com
Just an idea, but you could look at catering to the non-English speaking crowd. Specifically, the Chinese love to travel in big groups and they will usually skimp as much as they can on accommodation, in order to splurge on gifts and souvenirs. A cursory search turned up only very few sites that offer international hotels group buying options, even though group buying is extremely popular in China. Obviously, it would take you some time to understand the Chinese and their needs, but I'm pretty sure it'd pay off in the long run.