In response to a question about unproduced screenplays:
Every summer, Written By ((the WGA’s magazine) does an annual issue on unproduced scripts and they put up a bunch of those scripts on the WGA’s website. Try going to the site and doing a search for “unproduced”. You’ll turn up things like a comedy called No Contest which has been circulating for 30 years, attracting interest from (at various times) Barbra Streisand, Michelle Pfeiffer, Diane Keaton, Geena Davis, Sandra Bullock, Drew Barrymore, and Meg Ryan, without ever selling; a script about legendary silent movie character Fantomas coming out of retirement; a bunch of unproduced comedies, and a number of unproduced TV pilots, including one by Charlie Kaufman.