The Emacs Wiki has an area for storing elisp files
<URL:http://www.emacswiki.org/cgi-bin/wiki.pl/ElispArea>.
+* Emacs tutorials and manuals
+
+ * Emacs slides and tutorials can be found here:
+ <URL:http://stuff.mit.edu/iap/emacs/>
+
* Maintenance versions of some packages distributed with Emacs
You might find bug-fixes or enhancements in these places.