If anyone is heading to Bangkok, I just purchased a great little book called "Bangkok's Top 50 Street Food Stalls". It has heaps of information about the different areas in Bangkok and the best street food stalls to eat at. It is really well put together, has photos of each stall. There is also a description of different types of street food and drinks that can be bought, their Thai names and useful Thai phrases.
You can purchase it here http://bangkokglutton.com/my-book/ for around 500B which includes the cost of sending it internationally. I am in Australia and received mine within a week.