Kaspersky Lab originally posted the first part of "Malware Evolution: 2005 " in February. The paper covers Trojans, viruses, various other types of malware including multi-platform malware, and trend analysis that includes bank scams and adware.
The company recently posted "Malware Evolution: 2005 Part Two" which makes for even more interesting reading. The second part covers confrontations between malware developers, incident response time, rootkits, blackmail, and more. Check it out!