Creating a rule to email Storm person/organization when field is updated?

I'm wanting to create a Rule, such that when a new Storm project is created, and an appointment date is selected via a CCK field I've added to that content type, the referenced organization will be emailed with that date.

Any idea how I'd do that? Using the Send Email action, I'm currently only given acting user and node creator as recipient options; how would I tell it to email the value of a loaded field?

Thanks! Apologies for the lack of documentation work; I'm just now finishing off the project I'm using Storm in relation to.