After upgrading to Leopard, you'll probably find something missing when you first launch Terminal: "Welcome to Darwin!" For some reason, the file that generates this message, /etc/motd, is not included in Leopard. This means no message of the day in Terminal, or any other app that picks up on the motd file.
You can create a new one, though, using your favourite plain text editor in Terminal. For example, sudo vi /etc/motd. Press a to switch to add mode, then type whatever you'd like for a welcome message -- I went with "Welcome to Leopard!" but I guess "Welcome to Darwin" would have been more appropriate. When done, press Escape, then :w to write and :q to quit.
Next time you open a Terminal window, you'll see your new message of the day.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20071027054949353