They pointed out the faster shooting (and bigger buffer) on the 40D, which is a very good point in the circumstances.
Of course they did they are camera geeks, there is aways something better on the next model up and always someone who will be happy to help you spend your money when they don't have to pay the bill. The 450d is a great camera and there will be a few around as the 500d is coming out, and no you don't need one of those either.
MB
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"we had roots that grew towards each other underground, and when all the pretty blossom had fallen from our branches we found that we were one tree and not two"