Just a few months ago, banks were howling with outrage over "screen scraping," an ugly term that describes how technologists can gather information about customer accounts from a bank's Web site on the customer's behalf but unbeknownst to the bank.

Customers can see all their own financial data--or even things like e-mail and frequent-flyer mileage accounts--from any number of institutions, all aggregated on one Web site. And these sites were run not by banks but by technology upstarts such as VerticalOne Corp. or Yodlee.com.

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