Evermon - free Flash intros that can be customized for a price
EyeWire - 3D Flash Animation $9.99 each
Flashblaster from Scream Design - pay only, now $24.99 to $29.99 for full images
FlashBanger - freebie headers available; also pay-to-use Flash
FlashTyper Engine - for free Flash text headers; sign up required
new! InstantCoffee Flash Website Builder - build your Flash web site for $49. 30 days free trial. From the makers of CoffeeCup products.
Pro Flash Designs - Intros priced from $35 and banners priced from $7 to $18; tutorials.

Flash Tutorials & Help Pages

CoffeeCup Firestarter Help - Tips and tricks, etc.
FlashKit Tutorials - For beginners and above
Help4Flash - Tutorials, forums, and more
Swishzone.com Tutorials - Click on Tutorials at main page or here
Webmonkey - Intro to Flash 4; links to tutorials for Flash 3 and 5

Flash Animation Creation Software

CoffeeCup Firestarter - $49; free trial download
Swish - $49.99; free demo download - animations created with this demo cannot be uploaded to website
Flash Intro Builder - Build from templates $19; demo is free (download from CNet)
Macromedia Flash - The granddaddy and original of the above versions. Latest version is called Flash MX which you can try before you buy. Click on the link for Macromedia Flash MX which will take you to a sign-in page.  Or click here for Flash MX at CNet. Also look under Software at CNet for vendors selling older versions of Flash for less.
NEW! Wildform - reasonably priced Flash animators, encoders, editors, and players. I used WildFX to create the simple header for my graphics site.

Flash Forums

FlashKit Forums
Macromedia
Swishzone for Swish