I'm in the process of transferring over my recipes from 'blog' content in The Cookbook to the format provided by the Recipe Module. This module utilizes the Schema.org Module which I already had running on my site. [Looking up the url of one of my recipes on Google's Rich Snippet testing tool or in Google Recipes - will show you what data is machine readable.]
My biggest qualm with the recipe module? Out of the box the output looks like someone threw up on my site. I ended up copying and pasting the recipe.css content to my custom.css file in my theme layer and edited the page using firebug/firefox to get the layout to my satisfaction. The image is actually a schema.org configured image added as a field - so I used my already established method of creating 'round images' to give the image round edges for a smoother look.
The default picture for recipes was found on Stock.xchng and is 'forklove' by stuntcrazy.
Example recipe - Lemon Coconut Squares