For example this question:
Has 40k+ views. Usually a question can have 100-200 views if it's interesting. Why this one is so much viewed?
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Typically this happens if the question is featured on another popular web site (Hacker News, Reddit etc) or if it's tweeted by someone like Jeff or Joel. Oh, and appearing on the podcast helps, too.
When a question gets a lot of views (say more than 2k), it's usually because of one (or more) of the following reasons:
In this example, it looks like the 3rd one applies.