"We have no bad software or installs or anything that would indicate a need to ban people from viewing our site," wrote Matt Blatchley, who works for the Greenbush Southeast Kansas Education Service Center, in a posting on Friday to Google Groups.
View the source and look at the bottom of the page. See the code that looks like
He also mentions that Google will be working to help site owners better diagnose why their sites got a malware warning.
The principal message seems to be that even though YOU didn't place malware on your site, somebody else may have. Servers do get hacked (malware writers are often into hacking) and not every employee is on the level.