The first place to look is always ScriptWeb, a site devoted to Macintosh scripting. You can reach it at <http://www.scriptweb.com/>.
There's also a database of every known scripting link on the net, available at <http://www.wrldpwr.com/scriptweb.links.search.fcgi>.
And of course you can check out CLImax's home page at <http://www-personal.umich.edu/~athaler/CLImax/>!!
FTP Sites
Info-Mac has a section devoted to AppleScript. Go to your favorite info-mac mirror (or the original at <ftp://sumex-aim.stanford.edu/> and look in the path /dev/osa. You can find lots of scripting additions and alternative script editors here. Definitely worthwhile.
Mailing Lists
The MacScripting mailing list is probably the biggest, most action-packed list relating to AppleScript out there.. Visit the list's homepage at <http://www.dartmouth.edu/info/macscript/mailing-list.html>. To subscribe, send mail to LISTSERV@Dartmouth.edu, with "SUB MACSCRPT your name" in the body of the message.
Apple also has a mailing list for AppleScript users. Get more info at <http://abs.apple.com/pub/applescript/applescript.INTRO>.