Here's how this account aggregator put it:

"We've introduced a completely new home page that provides different "views" of your account data that make it easier to keep an eye on your account activity and empower you to manage your finances in new, more powerful ways."

The goal is to give you global views on your net worth and your past transactions. They also provide e-mail consolidation. I suspect it's not their core value proposition, but since people keep checking their e-mail, it's a way to move them to MyYodlee.