It's better to list a few web sites that between them contain virtually all important links than to try to list all those links, so here they are.
ScriptWeb, a web portal to all things scripting-related:
MacScripter, a live collection of news items, examples, and links; now also incorporates AppleScriptCentral:
MacScripter's scripting additions repository:
Bill Cheeseman's encyclopedic site of history, examples, instruction, links, and more:
Main portal for XML-RPC and SOAP servers: