New Jersey's Cablevision Hijacks DNS Error Pages - Via Slashdot:

Selikoff writes "I just noticed Cablevision's Optimum Online service has begun hijacking DNS Error pages with, you guessed it, ad-supported results. Aside from hurting the underlying stability of the Internet, there have been instances where hackers have used such tools against customers. I know Road Runner customers have had to deal with this for a couple months now, although at least they have an outlet to turn it off." --- Update: 09/30 13:18 GMT by T : Note, as several readers have pointed out, this hijacking is of DNS errors rather than 404 errors as originally presented.

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Editor: My provider, Verizon, has been doing this also for a while. But if you push hard enought they will give you alternate DNS servers without this 'feature'.