Eliters Divisions System (EDS) - Pool Yahoo
Based on Divisional alignments and contested in two Play Periods each month. Players are seeded into Divisions of 10 Players each and at end of each Play Period the Divisions are realigned based on performance in the just-completed Play Period.

Shooters Choice Billiard Association
Has league information, a calendar of events and a scoring FAQ.

Virtual International Players Ladder
The largest Virtual Pool site on the internet. Players compete in tournaments.