Below is a list of studios that offer internships and/or entry level positions for people to get their foot in the door. Some studios offer internships more frequently than others. Feel free to post any others that you know of.
I don't see any at Iron Lore or Irrational (Boston or Australia), and Turbine seems to only be QA (sure it's an internship, but not one that people are gonna want). Where did you learn about the ones at Irrational and Iron Lore?