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.
Arkane Studios (Lyon, France)* Dark Messiah of Might and Magic http://www.arkane-studios.com/ *They are a Source licensee. They also have an Austin, Texas branch but most jobs are in France.
Quantic Dream (Paris, France) Heavy Rain http://www.quanticdream.com/ *Many positions require that you know French
You should be a contractor for people looking for work, nice finds.. If you want for others to save their time looking at the links, put the basic locations of each company.
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?