Any good email reminder startups?
Serene: - http://www.youbookin.com/ (online appointment scheduling)   
- https://etacts.com/ (mass messaging to multiple contacts)   
- http://snoozester.com/ (scheduled telephone reminders)      
- http://www.fyiremindme.com/ (automated reminders)         
- http://www.logicalware.com (Mailmanager by Logicalware)      
- http://www.spyvo.com/                                     
- http://mailmelater.com/