Not long ago I just loaded up the Google Adsense page from http://www.google.co.uk/adsense instead of the normal USA Google Adsense page http://www.google.com/adsense, and I was quite surprised when I got the following message with Internet Explorer Beta 2 Preview:

There is a problem with this website’s security certificate.

The security certificate presented by this website was issued for a different website’s address.

Security certificate problems may indicate an attempt to fool you or intercept any data you send to the server.

We recommend that you close this webpage and do not continue to this website.

Click here to close this webpage. 
Continue to this website (not recommended).

For more information, see “Certificate Errors” in Internet Explorer Help.

Here’s the same but as screenshots!

Now why has this happened? Well I basically think it has happened because the Security certificate Google Adsense UK is using is from the Google Adsense US site, which means that the certificate is registered to the domain name http://www.google.com and not http://www.google.co.uk