Student card! Guys, this can save you a lot of money. Even if you don't have one, arrange something. If you pass through Bangkok you can buy a fake one in the Kawasan st. with just pennies. If you arrive from Nepal you can also arrange something there. I traveled with a lady friend who showed her donor card... If you can invest in a card it's worth the money because of all of the student discounts you'll receive at every sight.
There is an express Line of the Beijing Subway from Terminal 3 to Terminal 2 and then to the city. It takes about 20 minutes to get to the city, and the price is 25Y (at least when I was there). There is also a shuttle bus that stops in Xidan, Beijing Railway Station, Beijing South Station, and Shangdi. I think a ticket is 15Y, or something like that.
Oh, and there’s a Starbucks!!