The travel industry has had these types of services for a while. Kayak.com and others allow you to track the trends of a fare from place to place and then highlights if the price is likely to trend up or down in the future. Now there’s a similar service for electronics devices (cameras, laptops, tvs) called decide.com. In addition to predicting the future price, the service also highlights when new models will be released. Read the techcrunch article.