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In Walt's review he says Safari has no tabs, but the iPad guide videos shows an Exposé style tab feature. Obviously he missed that bit.

There is no visible tab bar, but there is a way to switch between pages... at least that's how I'm interpreting it.

Isn't that just windows?

I believe the canonical term for them is "pages" (when you tap and hold a link in Safari, one of the options is "Open in New Page").