Just came back from the Chinese Visa office in Ottawa, and here is a brief walk-through of the experience.
I brought with me a completed application (done on line, and printed out, at home), confirmation of my hotel booking (from Expedia), a letter of confirmation of reservation from the Beijing hotel, my confirmed airline booking, and a passport with a minimum of 3 months validity AFTER your Visa allowance ends.
1. The Visa office is on the 14th floor (220 Laurier W), exit left from the elevator, it is at the end of the hall, on your right.
2. From the little machine at the door, get a ticket by pressing the button appropriate to your reason for going to the office, and collect your number.
3. Proceed to the waiting room and wait for your ticket number to come up on the LED screens over one of the service kiosks.
4. Hand in your document to be reviewed, then, if all is acceptable, take the receipt which shows when your Passport/Visa will be ready for pick-up. Don't lose it!
>The Visa reviewer (contrary to some previous statements on TA) preferred my Expedia booking documents over the actual hotel letter, as it proved payment was made, not just a reservation.
>There is a computer with net access available should you need it (as well as a printer and photo-copier).