Really like the public roadmap idea. It's mostly in my head.

I want Lightning Addresses too, selfishly. I don't use other services that have them and want to mess around with them. I think being a straightforward test ground for these new lightning features is one thing that attracts people to SN so it's definitely good for the site. (The most remarked on feature of SN to date is lnurl-auth, and I suspect a great lightning address implementation will also stimulate interest.)