MailChimp, the self-service email marketing firm, has announced new features to its platform. Page Mage, a third-party eBay listing service, has just launched, as has Payments-R-Us.com, an informational site to help merchants choose between thousands of credit card merchant account providers. Email Targeting MailChimp now allows its customers to segment their email marketing lists based on purchase activity (product purchase, amount spent, or product category). Another new feature of MailChimp is email targeting based on subscriber engagement. For example, a MailChimp customer can send a special campaign to loyal clients or send a “come-back” campaign to inactive members on their list before deleting those members. Payments-R-U...