Abstract: A retractable drill chuck system that is capable of being attached to a drill and drill bit; it can detect the initial breakthrough of the drill bit in a material and is capable of retracting the drill bit right as the drill bit breaks through the material; it has torque, force, and acceleration sensors to detect the breakthrough event of a drill bit; it also has an electromechanical mechanism to retract the drill bit from the material once the breakthrough event has been detected by the system; the retraction mechanism has a permanent magnet holding solenoid that, when activated, releases stored mechanical energy to allow the drill bit to be retracted.

Abstract: One embodiment of the present invention distributes data via a network to remotely located individuals. Evaluation feedback by one or more of the individuals is transmitted to others so that the feedback may be used by others to quickly locate the more useful data. The evaluation feedback may be in the form of ratings of product reviews. The feedback helps customers by allowing the more useful reviews can be quickly located.

Abstract: One embodiment of the present invention distributes data via a network to remotely located users. Historical purchase information for a first user is stored in a database. Authorization is received over a network from the first user allowing a second user to view at least a portion of the historical purchase information. In addition, the first user selectively specifies which historical purchase information may be viewed by the second customer. An electronic notification is transmitted to the second user, wherein the notification informs the second user of the first user's authorization.

Abstract: One embodiment of the present invention distributes data via a network to remotely located individuals. Evaluation feedback by one or more of the individuals is transmitted to others so that the feedback may be used by others to quickly locate the more useful data. The evaluation feedback may be in the form of ratings of product reviews. The feedback helps customers by allowing the more useful reviews can be quickly located.

Abstract: A facility for notifying a first user about a purchase made by a second user is described. The facility detects that the second user has purchased an item. The facility further determines that the first user has a purchase notification relationship with the second user. The facility then provides to the first user a notification that the second user has purchased the item.

Abstract: One embodiment of the present invention distributes data via a network to remotely located users. Historical purchase information for a first user is stored in a database. Authorization is received over a network from the first user allowing a second user to view at least a portion of the historical purchase information. In addition, the first user selectively specifies which historical purchase information may be viewed by the second customer. An electronic notification is transmitted to the second user, wherein the notification informs the second user of the first user's authorization.

Abstract: A networked computer system provides various services for assisting users in locating, and sharing information with, other users. The system provides a user interface through which users can establish contact relationships with other users. The system also provides functionality for users to identify contacts of their respective contacts. For example, in one embodiment, each respective user can conduct a search of contacts of contacts of the respective user. The search may be limited in scope to users that satisfy one or more particular search criteria, such as users that reside in a particular region or are affiliated with a particular group.

Abstract: A network-based contact management system provides various features for assisting users in locating, and sharing information with, other users. The system provides a web-based user interface through which each may user create a personal data record, establish contact relationships with other users, and specify permissions for allowing such other users to view the user's own personal data. Users can preferably view the personal data records of their respective contacts via personal address books in accordance with the permissions granted by such contacts. A search feature enables each user to search for contacts of that user's own contacts to locate other users of interest. A crossing paths notification feature notifies users when their travel plans coincide with those of their contacts.