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I was looking at this block ("Total Sent: $14,000,000") and I noticed a lot of transactions that look like SharedCoin (BTC mixing) transactions all clustered in the lower half of this block:
https://blockchain.info/block/00000000000000000db8c1d19346c299ef07e919f7fa515e86e19c8f9892b750Some of these total transactions total over $100,000 which is rare (at least as far I have seen).
EDIT: Hey, I see a block of $14,000,000 plus, without a huge number of little transactions, I check it out...