Subbscribe is a beautiful opt-in form for MailChimp and CampaignMonitor.You know that nice little pop-up window that shows up when you scroll through Tumblr sites encouraging you to follow the account. The only thing you need is jQuery and a MailChimp or CampaignMonitor form with the default name and email fields. Options list – ‘MailChimp’ or ‘CampaignMonitor’ url – Your MailChimp/CampaignMonitor form URL. You can get it from the form embed script under the action…