I know the word "action" means a lot of things so let me define it clearly 
In 6.x Drupal core provdies "Actions" and "Triggers." These come from the http://drupal.org/project/actions module for Drupal 5.x. That is the kind of action I'm talking about.
I'd like to integrate the purchase of an Action as an Ubercart product. I did some initial searches but was unable to find a module which does that. Has anyone done this? I think it could provide a lot of integration points because it is easy to create an Action to do random things (granting a role, publishing content, etc.).



I suppose what might make a little more sense would be figuring out a way to expose core Actions to CA.
Then you can simply check for a product on an order, though that in itself isn't ideal...