Open all links in Tabs in Safari
Use a hidden Safari preference to force the browser to open all links in tabs.
Edit in TextMate in Leopard
This post details the steps to take in order to get the “Edit in TextMate” input manager working in Leopard
Three vertical panes of goodness in Mail.app
The WideMail and Letterbox plugins give the ability to use three vertical panes in Leopard’s Mail.app similar to Outlook.