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It's "furikake" and is a condiment meant to be sprinkled on rice. My wife is half Japanese, so we keep it on hand to eat with sushi rice. You can get it at any Asian grocery store worth its salt...or soy sauce :-)

From wikipedia:

Furikake (振り掛け or ふりかけ) is any dry Japanese condiment meant to be sprinkled on top of rice. It typically consists of a mixture of dried and ground fish, sesame seeds, chopped seaweed, sugar, salt, and monosodium glutamate. Other flavorful ingredients such as katsuobushi (sometimes indicated on the package as bonito), salmon, egg, vegetables, etc. are often added to the mix.

Furikake is often brightly coloured, and flaky.

Outside Japan furikake can be found in most Asian groceries, near the katsuobushi in the ethnic food aisle of several major supermarkets.

it's a magical condiment from the land of the rising sun: usually has little seaweed flakes, massive amounts of salt and MSG, and other random bits (dehydrated egg, dehydrated fish flakes, etc). You can shake it over anything: rice, soup, your mouth... Go here (www.quickspice.com/scstore/japanesefoodfurikake.shtml ) to see the bottles of awesomeness.