Two Shortcuts for App Exposé
If you want to see all the windows for a particular app via App Exposé, there are two hidden shortcuts. For either, start by pressing Command-Tab to bring up the app switcher. Then, while still holding down the Command key, press either the 1 key or the up arrow. That puts you into App Expose mode, with all of an app's windows showing, and recent documents in a row across the bottom of the screen. Let up on the Command key, and then you can press Tab to cycle through all the running apps.
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Just depends on what sort of data you're storing, and your comfort level with storing that data with a third-party.
And on that topic, my bet is that we'll see an iPad app at some point, but not an iPhone app. But who knows!