Recently (since today) I've noticed some of the questions are highlighted as in the picture below. What does it mean and how does it work?
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It appears gmail tag is your favorite. – LifeH2O Aug 4 '11 at 10:17
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These are questions either tagged with your favourite tags or tagged with tags you are most active in.
Checking your profile I don't see any favourite tags, so it must be the latter.
Stack Exchange is trying to make a best guess as to what you might be interested in. To get more appropriate questions set up some favourite tags.
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