Trakt.tv can be extended with plugins to expand the features beyond the simple "api wrapper" thing. You can also write your own plugin.
Here's the currently available plugins:
- trakt.tv-ondeck: get the equivalent of "on deck to watch"
- trakt.tv-matcher: match a filename with trakt info
- trakt.tv-images: get images with trakt info
- trakt.tv-cached: automatically cache any GET request
- trakt.tv-queued: automatically rate limit API calls