These are a few of my favorite things.
Ebay listings for Brucemarble	My Ebay Listings
Marble Makers Guild	Several makers retail marble site.  Good marbles where makers get fair share.
Moon Marble	Bruce Breslow's shop
Mike Edmondson	Old time Marble maker with lots of links
The National Marble Museum	Contemporary works and history
Block's Site	Collectors and auctioneers of contemporary and antique marbles. Authors
Bo Stiff's	Marble colle3ctor and sales
Global Connections	Travel,books, and crafts
Frantz art Glass	Glass lampworker supplies
Sundance	glass supplier
Olympic	glass supplier
Bert Cohen's	Bert Cohen marble enthusiast
Marble Makers Forum	Marblemakers talk about stuff
Alans marble Board	Marble discussion forum
Tobler Glass	kiln controller project
Marble Crazy at the Moon	Marble crazy pictures and how to build a furnace.
New 15# furnace	Building the new furnace.
Color Wheel Pro	A program that allows you to create color schemes and preview them on real examples.