1. A clearinghouse system for communications networks, comprising: one or more computers which interface with a database, said database including records pertaining to one or more telecommunications carriers which identify infrastructure for one or more telecommunications carriers in terms of one or more of (i) types of equipment and performance characteristics for said types of equipment, (ii) location information including one or more of geographical areas, and (iii) business terms for telecommunications services or for provision of said infrastructure, and records pertaining to one or more end users which identify one or more of (i) telecommunications assets or devices or equipment owned or controlled by one or more of said end users, (ii) property assets owned or controlled by one or more of said end users, (iii) locations or types of devices or equipment used by one or more of said end users, (iv) performance, quality of service, or perceived quality or value experienced or desired by one or more of said end users at one or more locations, and (v) desired business terms or preferences for use of said telecommunications assets, said devices, said equipment or said property assets by one or more of said end users; one or more electronic interfaces to said one or more computers which permit said one or more telecommunications carriers or one or more of said end users or one or more third parties to selectively use, view, collect, or catalog information about one or more of (a) available telecommunications assets or properties and locations thereof, (b) locations or types of equipment or devices or property assets used by one or more of said end users (b) the owners or tenants of said available telecommunications assets or properties, (d) infrastructure needs of one or more telecommunications carriers, (e) proposed business terms for fulfilling said infrastructure needs with said telecommunications assets or said property assets, and (f) performance or quality of service or perceived quality or value experienced or desired by one or more of said end users, wherein notification or access to information associated with said records in said clearinghouse system is provided to either or all of: one or more of said end users, one or more of said one or more telecommunications carriers; one or more of said one or more third parties who are not end users or a telecommunications carrier, wherein said notification is provided when one or more of the following events occur: (1) one or more of said end users, or one or more of said one or more telecommunications carriers, or one or more of said third parties who are not end users or a telecommunications carrier request information associated with said records in said clearinghouse system pertaining to either one or more telecommunications carriers or one or more of said end users, (2) suitable available telecommunications assets or properties for said infrastructure needs of said one or more telecommunications carriers at one or more locations are identified (3) performance, quality of service, or perceived quality or value of delivered telecommunications service for one or more of said end users, or said one or more telecommunications carriers, becomes worse or better than a specified tolerance or desired performance level as specified by one or more of said end users, (4) performance, quality of service, or perceived quality or value of delivered telecommunications service for one or more of said end users, or said one or more of said one or more telecommunications carriers, becomes worse or better than a specified tolerance or desired performance level as specified by one or more of said telecommunications carriers, and (5) performance, quality of service, or perceived quality or value of delivered telecommunications service for one or more of said end users, or said one or more telecommunications carriers, becomes worse or better than a specified tolerance or desired performance level as specified by one or more of said third parties.