But how It could have cached a bad lookup? The CNAME was set to 
ghs.google.com from day one.

Here an example network settings: 

Ethernet adapter Local Area Connection:

   Connection-specific DNS Suffix  . : chello.pl
   Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
   Physical Address. . . . . . . . . : [...]
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : [...]
   IPv4 Address. . . . . . . . . . . : [...]
   Subnet Mask . . . . . . . . . . . : 255.255.254.0
   Lease Obtained. . . . . . . . . . : 24 wrze˜nia 2011 09:33:25
   Lease Expires . . . . . . . . . . : 30 wrze˜nia 2011 06:09:11
   Default Gateway . . . . . . . . . : 87.207.162.1
   DHCP Server . . . . . . . . . . . : 10.131.40.1
   DHCPv6 IAID . . . . . . . . . . . : 249613134
   DHCPv6 Client DUID. . . . . . . . : 
00-01-00-01-13-77-89-56-E0-CB-4E-81-94-81
   DNS Servers . . . . . . . . . . . : 62.179.1.63
                                       62.179.1.62 

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