Question about internet ethics? and how DNS is handled.

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Peter Kringle wrote:
> I would like to get the thoughts of others on the following...
> Say you are an ISP. You run your beautiful DNS servers. :)  Then there is 
> an idea...  Why not place a server in front of the DNS servers.  And 
> every time the user types in an incorrect RR, hijack the session and 
> redirect them to a search page which allows them to search for the 
> mistyped RR.
> 
> Sounding familiar yet?
> 
> I don't want to start a rant, I just want solid ideas and why it is or why 
> it is not a good idea to do.
> 
> Thanks for your thoughts.

First thought: How do you know that the record request is coming from an 
interactive browser session, and not, for instance, a mail client or an 
FTP client, or some other application that has no "session" to hijack 
for a redirect to a search page?