The report claimed that 60 of the top 100 most popular Web sites had hosted malware or otherwise been involved in its transmission during the first half of 2008.
The biggest factor appears to be the new-wave highly interactive Web 2.0 sites, which allow users to upload all the data that their hearts desire. Some of this data will inevitably contain malware, or is actually crafted as an infection, and the host is not geared to check for such things.
The report also complained that Web servers are increasingly under attack from persistent cross-site scripting (XSS) and SQL injection attacks, as well as DNS cache poisoning.
Obviously, if the big sites are having so many problems, no one is safe. Anyone with a Web server must take security seriously.