FileBot is the ultimate TV Renamer and Subtitle Downloader. It just works. Easy. FileBot is really smart about matching your episodes with online episode info from sources like TVRage, AniDB, TheTVDB or movie info from OpenSubtitles and TheMovieDB. The naming format and folder structure FileBot will apply to rename your media files is extremely powerful and customizable but at the same time really quite simple. Fetching subtitles has never been easier neither. FileBot will automatically lookup subs from various sources and intelligently match them to your media files. Just drag your files in and FileBot will do the rest. The GUI is extremely efficient, it's all just a matter of 2-3 drags/clicks. But if you're the really lazy kind, you can automate just about anything using the fully-featured cmdline interface.
The program is really handy and easy to use. I've been looking for something like that. You can easily specify the output format to match your existing file-structure. Additionally the GUI looks quite modern.
Anyhow, I have to subtract one point from the rating. The installer contains Adware (toolbars and so on) that are automatically installed if you're not careful what to click. Especially the second one (I already forgot the name. Some kind of gaming-website) is nasty: It looks like a standard-license-agreement. This can be declined without drawbacks. All this might be legal, but in my opinion, is not legitimate office routine aiming to trick unexperienced users into using their products (And filling performance-optimized HTPCs with junk)
Be sure not to just click through the installation!