I don't know when it sprang up, but Rainbow Bakery has opened up in Chinatown. It's hidden because it's located in the back of the parking lot of the Ai Hoa market on Hill St. Consequently you'd never know it was there unless you were in the parking lot, or walking down College St. (which doesn't have a lot of foot traffic). The name Rainbow Bakery is a little misleading because it doesn't have much in the way of traditional baked goods. It has french bread, Vietnamese crackers and a few packaged items, and that's the extent of the true bakery items. What it does have is banh mi sandwiches and a large liquid dessert counter (not drinks) with items such as tofu fa and tapioca soup. It also has a few dim sum items, including a huge steamed bao filled with pork, Chinese sausage and egg yolk.
On a similar note, a banh mi place called L A Sandwich has opened up in a small street to street minimall that straddles the 700 blocks of N. Broadway and New High streets. The time I went by it was a madhouse. Has anybody tried the food there?