>>3
Go to zdnet.com and the p2p download section and read the negative comments for those new-kid-on-the-block p2p's, that one has never heard of before. The web page for these fakes is typical, always one or two pages, with a clean, professional design, minimalist information, and few subdirectories.
I haven't bothered to do a DNS lookup for these sites but I'm willing to bet they are owned by Protected Media, Overpeer or some other **AA-controller minion.
Also see http://4-ch.net/news/kareha.pl/1105756399
It's no secret that the MPAA/RIAA has been uploading infected files, filled-with-zeroes files, and damaged files into Kazaa since a long while.

A few very suspicious (IMO) examples:
Warez P2P:
downloads-zdnet.com.com/Warez-P2P/3000-2166_2-10355165.html?tag=lst-0-3
www.warezclient.com/

Limewire:
downloads-zdnet.com.com/LimeWire/3000-2166_2-10344982.html?tag=lst-0-14
www.limewire.com/

Ares:
downloads-zdnet.com.com/Ares-Galaxy/3000-2166_2-10174222.html?tag=lst-0-18
www.aresgalaxy.org/

Xolox:
downloads-zdnet.com.com/Xolox/3000-2166_2-10290807.html?tag=lst-0-20
www.xolox.nl/

and so on and so on.
FreeWire P2P
...Ha, I notice that many of these end with "P2P"...

You could also check it for yourself: install one of these on a clean machine that you don't use. Then run a battery of tests looking for spywares, viruses and trojans.
Warning, don't use your own machine. According to reports, several of these virii/spywares/trojans cannot be removed without extended work or a reformat.