Elgg-Moodle Integration

Hi!

I've been working a little bit with Elgg as an admin for an
educational project, and I was wondering if there's any way of
integrating Elgg and Moodle, so there's a single sign on.

What we would like to accomplish is using the access feature on the
Elgg and never ask for a password again when going to a moodle
course.  The system will have to identify the same Elgg user in
moodle.

I guess I'd have to develop a plugin that allows me to do this and get
a "Courses" entry on the Tools menu.

What would you think? Is there anything like this already out there?
Is it the plugin developing the way to go?

Thanks so much for your time and help.

Juan González