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Evernote and Internet Explorer
I use Evernote for my writing work, and it's often accompanied by heavy web research. Snap view makes this a useful function by having both Evernote and Internet Explorer open at the same time.
This makes it easy to take notes while looking at the web source, including hyperlinks.
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.