Simple Contacts - Contact lens prescriptions from home
Founders Nation - Find or become a startup cofounder
Google Contacts - Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.
CoFoundersLab - Meet 250,000+ entrepreneurs online
FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
Findnlink - Find people to work with on your ideas.