[Zope] Best Event system for Zope?

Hi all, I need an Event system for my latest project and have looked at EventChannel (http://www.zope.org/Members/k_vertigo/Products/EventChannel), and although it seems like exactly what I need, it seems like the project is dormant (last change 2002). Is there a "best of breed" event system for Zope that I can use? Thanks Etienne PS. My requirements is to be able to have a Zope object register to be notified when certain (user defined) events occur. I'm not looking for an events calendar type of product!