Baydin makes Boomerang, a plugin for Gmail, Outlook, and YMail that lets you schedule sending emails, track responses, and remove incoming messages from your inbox, having them return when you need them. Available now at: http://boomeranggmail.com
We also make Boomerang Calendar, a smart calendar assistant integrated into Gmail - http://www.boomerangcalendar.com
500 Startups is a Silicon Valley based seed fund & accelerator founded by PayPal, Google, YouTube, and Yahoo alums. We have invested in a number of e-commerce and fashion companies, and have co-invested with numerous top venture capital firms.