MailChimp adds geo-targeting support and timezone scheduling
MailChimp is an awesome email service provider who I use extensively to send email marketing campaigns. (get $30 off via this link if you want to subscribe - yeah OK I get $30 as well!).
The new features in v5 means you can now target your subscribers by city and automate the sending of emails to a specific time within the recipients timezone. Video below for more details.