If you use the Terminal quite a bit, you might appreciate being able to eliminate some of the text that appears when you open a new Terminal window, before you even get to type anything. Type:
touch ~/.hushloginWhen you hit return, this creates an empty file in your home directory called .hushlogin, which is a flag for the system to not show the Message Of The Day ("Welcome to Darwin!" is the default), and to not show your last login time.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20020815092443196