Unbeknownst to most (as it looks, at first, like just another coffeehouse) this is actually a really nice place to have dinner!
Back to Back is a worker-owned cafe connected with the IWW -- the ultimate Portland liberal coffeehouse -- and it's nice, unpretentious, and serves up one of the cheapest and best hearty meals to be found anywhere. The location is atmospheric and down-to-earth appealing. Sandwiches run from $3-5 and soups and side orders are equally cheap. Drinks aren't too expensive either. I bought a whole dinner here, including a glass of mead (!) and tip, for under $10. It's extremely veggie-friendly -- I don't believe they serve any meat, but they do have cheese and egg items for the animal protein-inclined.