RE: DNS poisoning at Google?

Well as Jeremy pointed out, your site is issuing
redirects, he gave you the command to show it:

curl -e ''

So if you're sure your server(s) haven't been hacked,
your application appears to have been hacked. It only
issues the redirect if the visitor comes in from a
google search.

Also shows a redirect if you use or (and probably others) but not, for instance,