Tagging and rating movies on your iPhone/iPod
Getting a movie onto your iPhone or iPod touch isn't a great feat: you import your possibly converted movies into iTunes, set up syncing of Movies, and Bob's your uncle.
I like adding information about the movie (i.e. meta data), and I use MetaX to do so:

Apart from Title, Artists, Genre, and other usual information, Metax can also add cover art and set a content rating on the movie. (It uses a modified version Atomic Parsley to write the tags.) I can then use the iPhone's Restrictions setting to avoid a child (or anybody else) seeing <insert your particular content> when you lend your iPhone.
For example, I've rated the movie Taken in the above screen shot as being Restricted, and after syncing the film to the iPhone, I see that rating displayed:

I can then set up the iPhone's restrictions to show films that are, say, PG 13

and movies rated above that are no longer displayed on the iPhone or iPod.
