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Mail and other apps
Having Mail open in a narrow pane allows keeping an eye on incoming email while doing other things. I find this particularly useful having Mail open while using Internet Explorer.
While clicking a link in an email will automatically open the browser (called auto-update by Microsoft), already having the browser open will respect the window size I've set. Auto-update opens the browser in a half-screen pane which then must be adjusted if not optimal.
I usually have the browser open anyway, so this is a good configuration for me.
Using Mail in snap view is certainly not limited to the browser, I regularly use it with other Metro apps too. The key is letting me keep up with email in case something important comes in.
Watching ESPN alongside email
I'm a sports nut, and the ESPN app is a very good Windows app. Watching highlights using the app is a good leisure activity, but I still need to keep up with work email. Not that I watch video on ESPN when I'm working, mind you.
When I do use the ESPN app I usually do so with the Mail app open in a narrow pane on the left. That lets me see all email as it arrives when I'm not engrossed in watching my teams. Which I never do when I'm working. Honest.
Flipboard and Internet Explorer
The Windows version of Flipboard is a good way to watch out for tech news, while keeping up with my Facebook friends. My favorite way to do that is with Internet Explorer in the other pane using snap view.
This has the advantage of having links I tap in Flipboard open up in the browser, while keeping Flipboard open.