[linden]

Was just about to point you there! Another broad category of use that is emerging is around notifications. ex. IF "I am tagged in a photo on FB" THEN "Call my phone". Its all still in the early going, but we've have seen a lot of interesting uses already. Working on a simple way for others to share the more interesting ones now!

[arctangent]

Will there be a way for developers to write their own triggers and actions?

[linden]

Yes, we are really looking forwarding to being able to open it up as a platform. Working as fast as we can :)