In "Effective Websites: Forwarding Email As Convenient Means To Enter Data," web effectiveness consultant Alan Rimm-Kaufman touts the ease with which you can email into Highrise:
Highrise is a simple and elegant CRM system from 37signals.
With Highrise, you blind-carbon copy a special drop box, something like [email protected]. The app does all the hard work, determining who you are from the dropbox subdomain, parsing the email to determine where to file it it the CRM system, and associating the message with the right people and companies and dates.
Forwarding an email is really simple. Bccing an email is really simple.
Learn more about how Highrise and email are best friends.
An example of how you can forward an email into Highrise.