Eating in TOKYO
Yamanekoya (03-5472-3608) serves great Okinawan food, and would be worth a trip across town. They're always crowded though, so try to reserve ahead of time.
Atagoya (03-3436-1219) does nice all-tofu dinners starting at Y3000 or so. I think you may have to reserve in advance though. (Same day is okay.)
Tatsukichi (03-5777-1717) is a charming izakaya with good horsemeat and amazingly crunchy grilled eel bones (lots of calcium).