CLa (short for Craigslist Aggregator) automatically searches Craigslist listings for items that match your specified keywords. You can narrow the search to a specific geographic region and available Craigslist categories and also specify a price range where applicable. The program runs in the system tray, automatically updates the results every X minutes and notifies you when new items are found. CLa can keep track of multiple searches in different categories and regions at the same time.
