I put my visa paperwork in this morning. I hadn't forgotten anything or stuffed anything up, and the lady said I'd done a good job. I wanted a one year multiple entry visa, but she said she could only give me a six month multiple entry, because I've not had a multiple entry visa before. I don't understand their system. I don't know what they're trying to guard against. The visa will allow me to stay in China 30 days at a time. Fortunately Shenzhen is right across the border from Hong Kong, so doing a "visa run" every thirty days will be cheap and easy.