FavBot is a persistant search engine, meaning that once you type in a word for what you are looking for into the search bar, the engine will perform that search for you, again and again, every day, and keep track of the new results that pop up. You can then check back after a week and look over a master list of search results. It's a free service with registration and can work using a list of items you want searched for. Each new search result found from day to day is listed as a discovery. You can also have FavBot perform a number of specialized searches, including results that are limited to news, blogs, images, and local events.