Hey Marc,
In fact, what you posted is indeed Estonia related. I've lost count, but managed to capture some of the IPs for our IT wizards.

The F Secure and Norton anti-virus programs we use indicate the same Russian-based IPs nearly every day, even on my home PC.

Security professionals and analysts said they were not surprised by the figures.

"Recent statistics indicate that one in every 10 Web sites is infected with malware," said Forrester Research analyst Chenxi Wang. "Therefore it is highly likely that an unsuspecting Web consumer—one that does not have adequate protection in place—would encounter a malware hosting Web site browsing the Internet."