With the latest release, Google Desktop 2.0 introduced script plugins. That means that it's now easy as ever to create sidebar panels. So I went ahead and created a Movies plugin -- you specify a zip code, and it will display customized movie listings for theaters near your home. You can also filter by genre, MPAA ratings, or user ratings, and sort by popularity or ratings.
Not bad for half a day's work, eh? That's putting the Thanksgiving break to fruitful use. :-)