1. A computer system implemented method for identifying and distributing municipal bond trading-related information, the computer system in communication with at least one user, the method comprising the steps of: receiving at the computer system a notification of a municipal bond trading event; generating, using the computer system, a characterization of the event, the generation performed at least in part on the basis of the notification, the characterization comprising at least one characteristic associated with the trading event; using the computer system, identifying the user from among a set of users, information regarding which users resides on a computer storage medium accessible to the computing device; using the computer system, accessing a filtering criterion associated with the identified user; using the computer, checking whether the bond characterization satisfies the accessed filtering criterion; and if the bond characterization satisfies the filtering criterion, transmitting to the user a message containing at least a subset of the notification.