Knocked Up
Synopsis: "Rising journalist Alison Scott (Katherine Heigl) hits a serious bump in the road after a one-night stand with irresponsible slacker Ben Stone (Seth Rogen) results in pregnancy."

Edit summary: Cut a lot of teen humor and some of the more stereotypical tropes to make a more heart-felt story.
Midnight in the Switchgrass
Synopsis: "Two FBI agents cross paths with Crawford, a Florida cop who's investigating a string of murders that appear to be related."

Edit summary: Cut most of the Bruce Willis scenes and about half of the Megan Fox scenes, focusing more on Emile Hirsch's character and the darker half of the plot.

While the cuts can't make it into a great movie, they do improve the acting and plot quality a bit.
Burnt
Burnt (2015)
Synopsis: "Adam Jones is a chef who destroyed his career with drugs and diva behavior. He cleans up and returns to London, determined to redeem himself by spearheading a top restaurant that can gain three Michelin stars."
No Edit Necessary
Julie and Julia
Synopsis: "Julia Child's story of her start in the cooking profession is intertwined with blogger Julie Powell's 2002 challenge to cook all the recipes in Child's first book."

Edit summary: Cut all of the Julia Child (Meryl Streep) scenes except when Julie is watching her on the TV.
Helix
Synopsis: "Centers for Disease Control scientists Alan Farragut and Julia Walker have seen their share of disease outbreaks in their time with the agency. But they have not experienced anything like what they see at high-tech research facility Arctic BioSystems. When the two lead the rapid response team that investigates a possible disease outbreak at Arctic, they enter a life-and-death struggle as the virus evolves."

Edit summary: Cut the majority of the weird cult plot that dominates season 2, and a few melodramatic or slow scenes in the first season.

The 3rd revision makes huge improvements to the second season edit, fixing plot holes and cleaning up rough edges in the original edit.
Atlas Shrugged
Synopsis: "Railroad executive Dagny Taggart and steel mogul Henry Rearden form an alliance to fight the increasingly authoritarian government of the United States."

Edit summary: Cut the affair and tweaked the moral to be less heavy-handed. Also made a bunch of minor cuts in an attempt to improve the flow and dialogue, although some of it is still pretty rough.