I'd post some of my wife's recipes and ones I've discovered.. but really --- just ask over at recipes.com or about.com and you can find tons of likely items.
http://bento.com/tokyofood.html is a good starting point.
Favorites at our house include teriyaki chicken on rice, chicken'n'veggies with rice, okonomiyaki, super-miso (my wife's enhanced version), mochi, taiyaki, sukiyaki, shabu-shabu, warm hijiki salad, umeboshi, and a few dozen others. We're also hooked on a variety of "sprinkles" (furikake: seaweed or fish flakes with various whatnot).
Favorite snacks include nori rice crackers, wasabi-fied peas, squid jerky, various forms of sushi (meaning "stuff on rice with seaweed or wrapped in rice" ... we don't do the raw fish at home).