Three-Pane Viewing

One of the few good things about Outlook is the three-pane view: mailboxes on the left, message list in the middle, and message on the right. It is such a time saver when you have to crank through a ton of e-mail. 

One of the major shortcomings of Mail is its lack of the three-pane view. Thanks to some inspired work by Aaron Harnly and Dane Harnett, the three-pane view can be yours in Mail via a sweet plugin. 

Peep Letterbox and Widemail.  

I'm rolling with Letterbox right now, but Widemail has some nice unique features as well. Someday a mash-up of the code for the two of these will create the perfect three-pane view for Mail, probably just in time for Apple to enable a three-pane view itself.