uTorrent 1.6.1 is the safest client to use (and the fastest, I've pulled 1.2 megs a second down on it). All versions of uTorrent past 1.6.1 are developed by the company that produces the official BitTorrent client, the company that is in bed with the MPAA (take a look at bittorrent.com if you don't believe me). People say there is no proof supporting something bad could happen, but the fact is that when downloading/seeding, in addition to your connection to your peers and the tracker, there is another connection going out to an IP Address that is neither tracker nor peer. If thats not a red flag, I don't know what is. And if you don't believe it, download wireshark and watch for yourself.
That connection is the DHT bootstrap. If you run something that blocks that connection, you will notice that it can't establish a connection to any nodes for DHT. If you are really paranoid you can always turn DHT off. I do anyway since for the most of it, it is a pointless feature.
I have DHT off, next guess?
Edit: So I don't seem like some idiot, here is a bit more proof:
uTorrent 1.7, NO other torrents going other then 1 linux iso torrent, no other applications running (actually running in wine), separate dedicated IP = Mediasentry IP hits 36.
uTorrent 1.6, same torrent, same system = 0 Mediasentry IP hits.
Every version > 1.6.1 is Bittorrent Inc., which is directly in partnership with the movie studios. Viacom Inc.'s Paramount Pictures, News Corp.'s 20th Century Fox, Lionsgate, Palm Pictures and Kadokawa Pictures USA etc etc .
In fact versions > 1.7 don't even have the same developer doing it. It's all handled now by Bittorrent Inc's development. The original author (up to 1.6.1) is no longer even part of the project.
Right from uTorrent's FAQ
"Who makes µTorrent?
Ludvig Strigeus (ludde) is the original author and former maintainer of µTorrent.
BitTorrent Inc's developers are the current maintainers of µTorrent. "
You want to call me paranoid? Thats your opinion. But when 1.6.1 works just as good and doesn't have the potential to be sending information to a company known to protect intellectual property, why would I consider an upgrade?