App Annie - App Annie is a marketing analytics tool available for apps of all kinds. With App Annie, you can track sales, traffic, and a variety of other factors pertinent to monitoring an app's trajectory.
Really Good Emails - A large collection of good product email design.
AppFollow - AppFollow is an integrated solution that makes monitoring, analyzing, and elevating your app's reputation easy.
Good Sales Emails - Best sales emails from great companies
appfigures - Cross-platform app store analytics for all of your mobile apps.
Great Email Copy - A dose of emails from around the web.