Hi HN - I've just shipped the first iteration of Submarine, a CRM that's built to store all your team's marketing contacts. It auto-archives conversations over email and Twitter, and has a Chrome extension that brings up contact data if you're on a contact's website (or Twitter, Facebook, Linkedin, G+ or Pinterest page).

I'd love some feedback on the landing page, and on the app itself (there's a free 30 day trial, and you don't need a credit card to try it out).