• The Professional Disc Goal Association
• Discsports.com - useful info, and a good set of links.
• Brian Filter's PDGA list of Disk Golf Courses
• Discgolf.com - a kind of annoying frame-oriented set of links, but lots of them.
• The rec.sports.disc Disc Golf FAQ. Very useful.
• Jonas Lof's excellent Guide to Throws and Grips

Vendors

• Discraft, my favorite discs.
• Innova-Champion.

Stores We've Bought From

• Flying Aces, (313) 428-2100
• Discovering the World, source of my tie-dye disks and disk bag.
• The Wright Life
• Also from Gary Lewis, the course guru down in Joliet.