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Well, there's a couple dozen different charts that Billboard has, and many of them measure different things.

But yes, the Billboard Hot 100, the main singles chart, is organized by combining sales (these days mostly all downloads) and radio airplay, (online streams from Yahoo and AOL are also considered, but those don't have a big effect on the chart yet).

Here's how it works: songs on the chart are ranked by a point system that carries over their audience impressions from radio; and then adds in their equivalent in sales (1 sale = 1000 audience impressions in this system). The total numbers are the songs' score.

Obviously, right now Utada is nowhere even close to debuting on this chart yet. There's maybe only 3 or 4 stations right now playing "Come Back to Me" at the moment, and if the chart went on forever Utada would probably be like #1000-something lol. We'll have to see how the song grows in the coming weeks and months as the add date approaches, it gets released on iTunes, and we get closer to the album release.

It's good to be excited! But also let's not get ahead of ourselves, there's still a loooong way to go.