Examples of saving a built search and getting results that update?

I am trying to build a search that allows users to build and save their own specific search query which then auto populates with products that match this criteria (and keeps updating with new products that match the criteria without any input). For example, I would enter that I want results that match *Brown, *Leather, *Jacket, and see a list of brown leather jackets, and get email alerts every week (or whatever amount of time I specify) when there are new jackets in my list, as well as be able to see any new jackets matching my criteria when I log in and view my list. Does anyone have some good examples or ideas of this, or some links to places that utilize this very well? Also, is there a name for this type of search?