Kaspersky Internet Security / AntiVirus 2009 (v8.0) / 2010 (v9.0) blocks google ads by calling it a Phishing Attack
It seems, some one at Kaspersky doesn’t like Google and doesn’t want its users to view the ads.
For last few hours, Kaspersky Internet Security / AntiVirus 2009 (8.0) / 2010 (9.0) seems to be blocking any website which contains with Google Ads via Google Adsense.

The problem effects all users having uptodate database and its been reported to affect all geographical locations. You may follow the development at Kaspersky official forum.
Ramesh K on November 23rd, 2009
Absolutely…. It started in evening… I thought my computer infected by some virus…. Thanks to you… Im secure and my PC too.
btw it seems it has been fixed.