To the best of my current belief and knowledge, the following URL's are still valid. But you know, one can never be sure. Everything comes and goes so quickly here!

Community MX
Flash Slide Show Dreamweaver Extension
Dreamweaver Exchange
Dreamweaver Depot
Dreamweaver Extensions Database
Dreamweaver News and Information
Dreamweaver Resources
Massimo's Corner
Rabi's Dreamweaver Extensions
Dreamweaver Templates
WebMonkey Dreamweaver Extensions
Sam's Dreamweaver Page (includes dynamic fonts)
Yaromat's Extensions
Dejanews Dreamweaver Newsgroup
Dreamweaver Tutorials, Templates, Extensions by Project VII
Another great Project Seven Page: Advanced FAQ's
HOT Dreamweaver Book author Lynda's site