I'm wanting to do an email signup form which, after the user enters their email and submits, a modal pops up asking them to supply more info if they like (for example, first and last name). If they don't enter any info, then the email address still gets submitted, since the other info is not required.
Here's what I'm thinking:
Ajax form for initial email to Lists#subscribe
Ajax form submission for extra details to Lists#edit_subscription