I tried for the longest time to find a place that gave succinct, reliable descriptions of my movies to put into the description field. I found that IMDB And AllMovie are great for a lot of things, but the descriptions leave a bit to be desired. Often they're too long, and the quality varies depending on who wrote them. I finally settled on Netflix, which has short, pretty useful summaries. And since every movie I have came from a DVD, it's almost guaranteed that Netflix will have a summary on them.
So, I guess my feature request would be a plug-in to automatically pull description data from the Netflix website.