First of all, excellent job. This pluggin made me move my entire website to WordPress. We have many forms on the new website and some of them are already increasing conversion by 50%.
Since the forms are placed in an iframe, I am having cross-domain scripting errors when I try to grab some data from the main page and passing it to the form. What I want to do is to pass the product name to the form when the prospect fills the contact sales form on the page. I want to avoid asking the prospect selecting the product when the form is already on a product page. Another option will be to pass a parameter with in the URL of the iframe like adding ?product=<product_name>.
Maybe the next version can allow passing info from the_post() to the iframe: post title, post permalink, etc.