Join Date: Feb 2007
Location: Central CA
Bikes: Fuji SST, Cotic Roadrat, Bianchi SASS, a bunch of others
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Well, 'cross-chaining' from your large chainring to your largest rear cogs is always going to be a little noisy- you should generally stick to perhaps the highest half of your cassette when in your largest chainring. If you intend to use the low gears on your cassette, move progressively into the smaller chainrings, as well.
You said this was a new bike, correct? You're very likely entitled to some sort of adjustment period. Buzz into your shop sometime and ask if they can take the chatter out- they should be happy to help.