How can I transfer movie files downloaded from VUZE to iTunes?
As a quick method, you can place the downloaded files in the "Automatically Add to iTunes" folder in your iTunes Media directory. iTunes will add the videos to your iTunes library if they're compatible with iTunes -- if not, it will place them in the "Not Added" directory. Set this as your default download directory in Vuze and it'll happen automatically!
(see http://support.apple.com/kb/HT3832 for more information)