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TechRepublic is owned by CNET, and I can assure you that they're not alone in planting cookies so they can bombard you with target advertising. (Yahoo and others do it as well.)
What these cookies do is record your browsing habits and hit you with advertising accordingly. If you do a lot of computer related browsing, you'll get hit with computer ads. If you do a lot of automobile browsing, you'll get hit with car ads; if you do a lot of hootchie-kootchie browsing, you'll get hit with ads you probably don't want your kids to see. But this is, technically, adware, not spyware, although I guess it could be considered a form of spyware.
The difference between adware and spyware: Any software application in which advertising banners are displayed while the program is running is called Adware. And any software that sends data back to a third party without asking the user is Spyware.
Adware is probably the most harmless kind of spyware, buy I suppose it's spyware nonetheless.
Do they sell the information? I've not heard of target advertising information being sold or shared, as it's a process that's directed by the cookies planted on your computer. But I can't say for sure, one way or the other. Someone else might know for sure.
Another reason for TechRepublic's planting of cookies is to facilitate an automatic log-in process. When you log in for the first time, you're asked if you want TechRepublic to remember your e-mail and password for automatic log-in. If you click the yes box, a cookie will be planted to record that information. This is true for other types of log-ins as well.
As a side note, I suppose I don't object to this adware) too much, and I consider it a trade-off for the free services the Web site provides. After all, they're a business and have to turn a profit. I'd rather have the advertisers pay their profit instead of subscription fees paid by me.
To search your system for various spyware programs, consider some of these tools:
http://www.spychecker.com/software/antispy.html
or tiny url
http://tinyurl.com/3yca2
There are a variety to choose from, most have free downloads available, and some may detect things differently than others.
Another possible article of interest:
http://www.silicon-press.com/briefs/brief.cookiead/brief.pdf
or tiny url
http://tinyurl.com/22x3l