[Zope] Best Event system for Zope?

[Etienne Labuschagne]

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!