Currently, I use Rapportive because I like the dashboard it adds to my Gmail inbox which provides context for my e-mail contacts. Chrome extension Vibe provides a similar service, but isn't constrained to Gmail. It lets you hover over an e-mail address you encounter online, and receive a drop-down panel of information about the person behind the e-mail.
When you install Vibe, it adds a button to the right of Chrome's URL bar. Before you begin using the service, you'll need to use that button to get directed to Vibe's Web site to create an account … Read more