About the rar files. I have been curious because ppl always ask and it's in about every torrentsites faq, and on the clients faq and so many other places. Just select all of the rar files and then extract them at the same time.
There ain't too many viruses in the bittorrent sites. And if there is ppl report about it and/or post it as a comment to the torrent and it the torrent gets removed and the uploader prolly gets banned. So the sites stay quite clean from viruses etc.