I needed to do this a few months ago, this could have been really helpful. What I did instead, was export one Gmail contact to CSV, import that into Google Docs

I needed to do this a few months ago, this could have been really helpful. What I did instead, was export one Gmail contact to CSV, import that into Google Docs Spreadsheet, then create a form there that people can fill out (with just the fields I needed) and send that off to their email. Once collected, I could easily sanitize the data, use it for my offline mailing (announcement card in this case) and export it back into Google Contacts (now I have the info always on my phone, etc).