There are a few out there - check out http://www.shelldorado.com - the links page has a rundown of the scripting sites available.

There's also my site - I've added a Tips and tricks area to my site where people can submit stuff, and I've also got a script repository, full programs, and some other stuff - of course all non-commerical, distributed under the terms of the GNU General Public Licence...

Cheers
ZB