To the question in your subject title, no the FBI will not drop by if you are torrenting podcasts. I say this with the condition that the torrent should be sourced from the producers of the podcast. Even so, I would be very surprised if a podcaster was to take action against torrenting of their show without their permission - because they distribute it freely, and it indicates that their show is so popular that people seek alternative means to get them.
To the question re: CNET's distribution, I can offer 2 possible answers. Not being TMV, or J, I would not be able to answer with certainty, however this represents my best shot at it;
1. Only one form of distribution allows CNET to keep a record of how many people are downloading their show. More than one would be less accurate because 1 user may download from a variety of distribution sources.
2. TMV, or J, just have not got around to implementing this yet. Some time ago Veronica and five Buzzers spoke over Skype for a trial run of user participation. The inundation of tech news, the fact that they have roles outside of BOL, and the fact that producing BOL every day is in itself a task, means they may not have the time to do so.
I now leave it to you to decide which answer you prefer.
There are a few video podcasts that have torrent rss feeds so that I can help out my favorite podcaster without crushing them (Rev3's Totally Rad Show for example). I use Democracy TV (soon to be Miro http://www.getmiro.com/) which has built in torrent support. As a side question how come cnet doesn't torrent their pod/vid-casts?