dimdim is aquired by salesforce so it's history.
Possibility of providing integration with

http://www.bigbluebutton.org/

API docs here
http://code.google.com/p/bigbluebutton/wiki/API#Overall_API_Usage

This is available as local install so better.

Regards

Hello,
you can find the discussion about big blue button here.

bye,
Giovanni. 

We provide BigBlueButton hosting services, and have lots of customers utilizing the efront, moodle, wordpress, and joomla plugins for BBB.   We would be glad to help you guys get an integration going with BBB....  we have dedicated and shared servers located in datacenters worldwide and provide inbound DID services if needed for your clients.

If you need access to a server for development, or help in understanding the api... give me a shout.

regards,
Stephen
hostbbb.com
sdame@207me.com