Mail in a more widescreen way!
This applies to both Tiger and Leopard. The Mail application is great, but it could offer more when it is used on a widescreen display. It would be nice to be able to use the whole height real-estate to read the email. It is possible to change the look of Mail so that it appears as three columns. An easy way of doing this is with the Mail plugin called Letterbox. What I really like about this plug-in is that the DMG file where you install the plug-in also includes "MailPluginManager". It is then very easy to uninstall these plugins in the future. You can learn more or download this application here on MacUpdate.