Replying to Virus information

I have a project in my computer science course and I have to do a report on diffrent types of viruses. I need some help to find good sources on either internet or litterary documents.

If any of you have good knowledge about viruses, you can post some of your info here.

So far I came up with this
Virus-definition
Types
Worm
Trojan horse
Macro virus
Virus hoax
E-mail virus
Category of infection viruses
Boot sectors
File Viruses

So far I have can define those terms, but I need to know more way of classifing malicious programs

All pertinent info in welcomed!
Thanks