When Dan Kaminsky broke the Internet, it was through a DNS exploit. That vulnerability has been defined and patched, but it still pays to understand and control what's going on with your DNS server. Leaving DNS up to whichever server the ISP wants to provide may work for the short term, but you (and your users) will be happier if you get some education and make some good choices.
And don't worry -- I'll wait a while before tacking the modern miracle that is the mobile device antenna. You'll love that one, you will...
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