Just read the information above on how to apply the chinese visa. I heard they are also requiring that you submit a copy of your itinerary and the invitation letter coming from the company/person you will visit, a copy of passport of the person to visit if you will not stay in a hotel.

I'm going to Shanghai on Jan 30, 2009

here are the requirements:

Primary Requirements:

-Applicant's passport with blank pages and at least 6 months validity left before expiration.
-A truly and completely filled application form affixed with one passport-sized photo.
-Round-trip air ticket
-Hotel reservation. Or proof of relationship in case of visiting relatives in china.
-Other documents required by the visa officers if necessary.

Additional Requirements:

-Employment Certificate with salary details and other compensation
-Company ID
-ITR and TIN ID
-SSS ID and contributions
-NBI Clearance valid for travel abroad
-Bank Certificate (or your sponsor)
-If will be staying to a friend or relative, provide Invitation Letter from friend/relative stating his/ her complete address and contact number (where the applicant will be staying)
-If the sponsor is a Chinese National, submit a photocopy of his/ her Chinese National ID or Chinese Passport

Hope this would be helpful :)