I have released ver 2 of my Gravity Forms + Custom Post Type addon plugin. You can see more info here : http://wordpress.org/extend/plugins/gravity-forms-custom-post-types/
Basically, you can easily map your forms that create posts to a custom post type. Also map dropdown selects, radio buttons list and checkboxes to a custom taxonomy.
I have upgraded it to work with both 1.4.5 and 1.5 beta using the new hooks which are awesome btw! Thanks must go to Carl and Alex from Rocketgenius who gave some excellent tips and feedback