Troubleshooting AutoFill woes

Dan Moren, Six Colors, did some testing to figure out what information AutoFill uses when you have multiple email addresses, phone numbers, addresses ... in your contact card:

Keep in mind this testing was limited, and involved a single simple form. It’s possible AutoFill does some more complicated automagic finagling behind the scenes depending on how a given site labels fields, but my informal testing suggests that if you want AutoFill to use a certain set of information, label those as “home.”