Maildrop
Maildrop is an OSX application that makes it easy to copy email from Mail/Entourage/Outlook 2011 into tasks and cases in Salesforce.com
Not under active development anymore. Feel free to fork and modify as you like.
Build
A git submodule is used to pull in zkSforce, a cocoa library for accessing the salesforce.com API, so you'll after you've cloned the maildrop repo, you'll need to run git submodule init and git submodule update