What is Adware..Spyware?

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Never heard of Adware/Spyware? Perhaps you heard about it but don?t quite understand how it can affect you. Even if you know all about it you just might like to brush up a bit.

Adware and Under-Wear - The Definitive Guide  

Inside this article by Mike Tuck you will find a brief history of Adware, how it effects you, and links to lists of known adware/malware/spyware.
There is also links to programs that help you to keep that stuff off your system and an excellent bibliography if you are interested in further source materials.