I found out that our friend Matthew did pretty much everything he wasn’t supposed to, so here’s a bit of advice to any future China-goers.
When you get off the plane, there will probably be a bunch of people waiting among the people there to pick up the arrivals, holding signs that offer taxi services and hotel accommodations. Do not trust any of them, because they are likely to rip you off. Matthew went with a woman offering taxi service, and ended up in a black car and being charged 550 RMB. The cost of travel from the airport to our guesthouse should only be about 200 RMB.
Here is what you should do if catching a taxi from Pudong Airport. Heading out, you should see a sign at the airport for taxis, and generally there will be a stream of people headed in that direction. You will be taken outside and wait in line for a taxi, herded towards the next available one by an airport staff member. The most reliable taxis are supposedly the yellow, white, or teal ones (I hear teal is best). If they are unwilling to use their meter, don’t trust them.