Here are some links to other sites with information on marbles and marble collecting.
Marble Mansion - Excellent Site all around for new or experienced collectors
EzBoard Marble Addicts - Lot's of good folks here I highly recommend this forum
EzBoard -Lou's Marble Connection Discussion Board Also Highly recommended
Alan's Marble Connection Another top site, excellent ID section
Alan's Marble Connection Peltier Page
Bob Block's Site (marblecollecting.com) Everything for the marble collector
International Association of Marble Collectors
OPMARBLES New Site Check it out!