Well, the new stable Azureus build just came out and it supports encryption.. Recently, a variety of ISP's have been throttling Bittorrent traffic extremely agressively making it virtually impossible to download anything at decent speed let alone seed anything. If everyone could update their Azureus or Utorrent clients ASAP the suffering would be over, these clients support encryption and the encryption will be compatible with one another so if you like one client over the other you can feel free to use either. Please help users who are being throttled to death! we can barely even seed or download! encryption seems to be the only hope. Do your part by updating or even switching from from a client you regularly use!
Azureus 220.127.116.11 with encryption http://azureus.sourceforge.net/
Utorrent 1.4.1 beta with encryption http://www.utorrent.com/download.php
If you are being throttled, then go in to the options and turn on encryption, if you are not you don't have to do anything, but people who are being throttled will be able to download from you with these newer clients so PLEEEEEEAAAASE update your client.