The first stop should be Macromedia's Authorware Developer's Center
http://www.macromedia.com/support/authorware/attain/dev_index.fhtml

Macromedia's primary Authorware homepage
http://www.macromedia.com/software/authorware/

Authorware Trial Software Download
http://www.macromedia.com/software/authorware/trial/

Updates and downloads are available from Macromedia at
http://www.macromedia.com/support/authorware/

Macromedia's TechNotes are what you get when you call technical support, or they are searchable at http://www.macromedia.com/support/authorware/

Almost all the useful sites for AW developer's I've used, I've linked from the Macromedia site
http://www.macromedia.com/support/authorware/attain/dev_index.fhtml

Within this list, the ones I've found most useful, (in ranked order) are:
The AWARE list. http://www.e-media.nl/aware/
A listserv for Authorware developers. Tolerant of beginners. If you subscribe, you'll have to choose between tens to hundreds of messages every day or the once-a-day index. I use the index, but you can't delete individual messages that you're not interested in. The AWARE site maintains an archive and is searchable. You'll often get answers from this listserv that tech support can't provide.

The Authorware Knowledge Base - A good site for searching for answer to Authorware development quesitons.
http://www.kw1c.nl/Aware/index.htm

The Media Shoppe - Authorware Files and Examples
http://www.mediashoppe.com/files/index.html

Joe Ganci's Home page. http://www.mrmultimedia.com
Joe's the author of the very useful Authorware 3 Internal System Functions Professional Reference, which remains useful today.

Dazzletech - Free Authorware examples and source codes
http://www.dazzletech.com/resaware.htm

Stefan Van As' Home page. http://www.wirehub.nl/~dav-stefan
There are lots of UCDs here, some free. Could be useful for a dedicated laboratory, but will require "trusting mode" if used at PsychExps.

The Authorware Ring
http://www.ix-software.nl/authorware/frames.html