interesting...
Doesn't seem to provide much back other than a list of search results with basic info. You can actually send the request via a web browser and timestamp and sig appear to be optional.
Example:
Search for "shrek":
-
http://app.imdb.com/find?api=v1&appid=ip...US&q=shrek
Response from server:
{"copyright":"For use only by clients authorized in writing by IMDb. Authors and users of unauthorized clients accept full legal exposure/liability for their actions.","data":{"results":[{"label":"Popular Titles","list":[{"tconst":"tt0126029","type":"feature","title":"Shrek","image":{"width":334,"url":"http://ia.media-imdb.com/images/M/MV5BMjAwMTEwOTY4OF5BMl5BanBnXkFtZTcwNTM5MjMyMQ@@._V1_.jpg","height":475},"principals":[{"nconst":"nm0000196","name":"Mike Myers"},{"nconst":"nm0000552","name":"Eddie Murphy"}],"year":"2001"},{"tconst":"tt0298148","type":"feature","title":"Shrek 2","image":{"width":319,"url":"http://ia.media-imdb.com/images/M/MV5BMTk4MTMwNjI4M15BMl5BanBnXkFtZTcwMjExMzUyMQ@@._V1_.jpg","height":475},"principals":[{"nconst":"nm0000196","name":"Mike Myers"},{"nconst":"nm0000552","name":"Eddie Murphy"},{"nconst":"nm0000139","name":"Cameron Diaz"}],"year":"2004"},{"tconst":"tt0413267","type":"feature","title":"Shrek the Third","image":{"width":1382,"url":"http://ia.media-imdb.com/images/M/MV5BMTMyMjE1Mjc1NF5BMl5BanBnXkFtZTcwMzY0MjEzMw@@._V1_.jpg","height":2048},"principals":[{"nconst":"nm0000196","name":"Mike Myers"},{"nconst":"nm0000139","name":"Cameron Diaz"},{"nconst":"nm0000552","name":"Eddie Murphy"}],"year":"2007"},{"tconst":"tt0892791","type":"feature","title":"Shrek Forever After","image":{"width":400,"url":"http://ia.media-imdb.com/images/M/MV5BMTY0OTU1NzkxMl5BMl5BanBnXkFtZTcwMzI2NDUzMw@@._V1_.jpg","height":593},"principals":[{"nconst":"nm0000196","name":"Mike Myers"},{"nconst":"nm0000139","name":"Cameron Diaz"},{"nconst":"nm0000552","name":"Eddie Murphy"}],"year":"2010"}]},{"label":"Names (Exact Matches)","list":[{"nconst":"nm1277920","known_for":"Transportation Department, \"Catch Me If You Can\"","name":"Mark Webb"},{"nconst":"nm1903847","known_for":"Actor, \"Lies & Alibis\"","name":"Sergio Bruna","image":{"width":450,"url":"http://ia.media-imdb.com/images/M/MV5BMTI0NDc5NDAyOV5BMl5BanBnXkFtZTcwODkyMjAzMQ@@._V1_.jpg","height":527}},{"nconst":"nm3331096","known_for":"Self, \"Big Brother\"","name":"David Sín"}]},{"label":"Titles (Partial Matches)","list":[{"tconst":"tt0897387","type":"short","title":"Shrek the Halls","image":{"width":155,"url":"http://ia.media-imdb.com/images/M/MV5BMTIyMDE0NDQ4MF5BMl5BanBnXkFtZTcwNjM1MjU1MQ@@._V1_.jpg","height":200},"year":"2007"},{"tconst":"tt0360985","type":"short","title":"Shrek 4-D","image":{"width":500,"url":"http://ia.media-imdb.com/images/M/MV5BMTI4ODU4NjU2OF5BMl5BanBnXkFtZTcwNjgyNTUyMQ@@._V1_.jpg","height":365},"principals":[{"nconst":"nm0000196","name":"Mike Myers"},{"nconst":"nm0000552","name":"Eddie Murphy"},{"nconst":"nm0000139","name":"Cameron Diaz"}],"year":"2003"},{"tconst":"tt0307461","type":"short","title":"Shrek in the Swamp Karaoke Dance Party","year":"2001"},{"tconst":"tt0410595","type":"video_game","title":"Shrek 2","principals":[{"nconst":"nm0332227"},{"nconst":"nm0276253","name":"Holly Fields"},{"nconst":"nm0609137","name":"Mark Moseley"}],"year":"2004"},{"tconst":"tt0290741","type":"tv_special","title":"Creating a Fairy Tale World: The Making of 'Shrek'","year":"2001"},{"tconst":"tt0928070","type":"video_game","title":"Shrek: Smash n' Crash Racing","year":"2006"},{"tconst":"tt1024946","type":"video_game","title":"Shrek the Third","year":"2007"},{"tconst":"tt1056092","type":"feature","title":"100 Things You Always Wanted to Know About Shrek But Were Afraid to Ask So We're Gonna Tell You Anyway Movie Special","year":"2007"},{"tconst":"tt0488580","type":"video","title":"Meet the Cast of Shrek 2","year":"2004"},{"tconst":"tt0286967","type":"video_game","title":"Shrek: Fairy Tale Freakdown","year":"2001"},{"tconst":"tt0488589","type":"video","title":"The Music of Shrek 2","year":"2004"},{"tconst":"tt0475753","type":"video","title":"The Tech of Shrek 2","year":"2004"},{"tconst":"tt1087816","type":"video","title":"The Tech of Shrek the Third","year":"2007"},{"tconst":"tt1640561","type":"video_game","title":"Shrek Forever After: The Game","year":"2010"},{"tconst":"tt1055313","type":"tv_special","title":"Shrek the Third: UK Premiere Special","year":"2007"}]},{"label":"Names (Partial Matches)","list":[{"nconst":"nm3318147","known_for":"Self, \"Episode #1.3\"","name":"Tony 'Shrek' Organ"},{"nconst":"nm3026404","known_for":"Miscellaneous Crew, \"Bad\"","name":"Steven Shrek"}]}]}}