Gary Price posts details on Google's new movie shortcut. Stick a "movie:" prefix on a keyword search and it'll bring up a list of matching movies and movie reviews.
It appears to search in the movie title, description, and reviews, making it a good way to find movies that match a rough description or to find a movie if you can't remember the exact title.
Here are movie searches for "monty python" and for "hong kong crime".
The movie reviews appear to be spidered from the web, online news sources, and Usenet newsgroups. Google does something similar for the product reviews in Froogle.
Amazon.com can't be happy about this trend. Product and movie reviews at Google are an alternative to the product reviews at Amazon and the movie reviews at Amazon-owned IMDB.