GData, a welknown German vendor of Anti-Malware software, has some interesing websites about malware amd how to prevent infections: http://www.gdata-software.com/security-labs.html

Some special and interesting websites are:

History of malware:
http://www.gdata-software.com/security-lab...of-malware.html

Malware categories:
http://www.gdata-software.com/security-lab...kategorien.html

Tips & Tricks:
http://www.gdata-software.com/security-lab...ips-tricks.html

Background informations:
http://www.gdata-software.com/security-lab...nformation.html