A simple but powerful Android gadget that geotags everything.  Always available on the main screen, with the push of a single button (bottone in Italian), it will record the timestamp and location when and where the butone is pressed.  The user gets to label the "type" of item being geolocated using a color-coded tag.  The user can have as many color-coded instances of ButOne on the screen as desired, each will produce a map of the items that the tag is intended to capture. For example one could make a tag for each "bike rack", "water fountain", "park bench", "damaged property", etc.  Different people tagging the same object with different tags will create a set of synonymous tags, similar to other collaborative filtering applications such as delicious.