With Quick Subs you can easily find subtitles for you movies and shows. It finds your video files automatically, and with one click you get the list of subtitles available for that movie or show episode. The app will download and put the file on the same folder as the movie, with the right name, so players can read them automatically.
You can search subtitles in 21 different languages for mp4, avi, mkv and wmv video formats, and it's powered by OpenSubtitles, one of the biggest subtitle database on the internet.
For now, it only look for files at the internal memory. External SD cards won't be searched.