How does it work:
After having installed ohmailchimp and enabled it, you just have to insert your mailchimp API Key in the setting view. From now on, whenever you create or edit an event, you will be able to connect them to a different mailing list previously created in your mailchimp account.
When people register to your event, they will be automatically added to that list, populating it out of the box and allowing you to manage communication, before, during and after your event in a more powerful and easy way.
Ohmailchimp also work with the new event frontend submission system
Mailchimp for ohanah is distributed for free when purchasing ohanah.
UPDATE 23.8.2011 - V1.0.4 Just released http://app.ohanah.com/release-notes
The extension is as simple to you that I didn't have to mess with thousands settings, just install it, insert my Mailchimp API key and now whenever I create a new event I can attach it to a separate Mailchimp mailing list.
Those guys are so quick and their development is unbelievably fast, every week a release and now they find the time to also start releasing add-ons for free for the price of the extension, what could I say, thanks Beyounic, thanks Ohanah again, you made my day!