Tag your collected items
Give us the ability to tag movies, series and episodes in our collection, using tags.
Tags can be marked as private, seen by friends or been public, like it's happening with lists.
Tags can also have their own unique custom color and can be manipulated through Trakt's API.
An example would be to tag some movies for their location in user's library, i.e. in HDD #3 or in BluRay #41. If someone want to do the above example now, using lists, s/he would end up having an enormous number of lists.
Another example would be to indicate the format (i.e. HD, 3D etc.) or if they have subtitles and/or commentary track.
Possibilities can be limited only by imagination.

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Thelostlemon commented
Implement the ability to categorise films yourself, and sort your films based on what you have tagged them as. some examples would include 'foreign language films' or 'feel-good films'. This way I can filter lists like the watchlist without having to use the default features
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fms commented
I concur, but please make it possible to make the tags private.
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Saxtus commented
@Azael: It means "in review" https://twitter.com/scottymeuk/status/425574034110423040
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Azael Carrera commented
What means STAGE 3?
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Azael Carrera commented
Please make this happen! It will be very helpful for organizing my library. Every time I want to see a movie or TV show I have to find the location number on a list I made from a .doc file haha :(
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sp1ti commented
I think something along with tags is already implemented from the XBMC side? no idea how far the support on the site is.
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JackOfAllGames commented
This is the single feature that I came to trakt, hoping to see. I would hope to take it further though. I'd hope that the most common tags for a show/movie would be viewable on the show/movie page, allowing for social genres of a sort. I don't know of anyone with such a feature for movies/tv shows to date.