Some people have complained about the strange look of Mail's toolbar, particularly the left indent on the buttons. It's actually quite easy to un-indent it -- Control-click on the toolbar, choose Customize Toolbar (or just use View -> Customize Toolbar), and then drag away the flexible space that's causing the indent. I couldn't just Command-drag it away, as you can with the buttons. Now, if I could have my status line back, Apple?
[robg adds: This is a pretty basic tip, but I know the indent has bothered some folks, and they may not know about customizing the toolbar -- so please hold the sarcastic comments! And regarding the status line, while it's definitely gone and I'd like it back, most of its functionality is now in the main window titlebar -- it will show total and unread counts for the chosen mailbox(es).]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20050513150538732