I am a (somewhat) recent convert from Linux to Mac OS X on the desktop and one of the things I have been sadly missing ever since my switch is the ability to have "tabbed" terminal windows (a la gnome-terminal or konsole for those of you familiar with the X environments) instead of a multitude of open Terminal windows to keep track of. Were you feeling this pain, too? Fret no more. iTerm is here to save the day.
It's a little rough around the edges still but it is a true lifesaver for me at least!
[robg adds: Hmm, this might be yet another tabbed-window app to become addicted to. Managing multiple terminal windows in one main window is quite convenient, and iTerm supports unique color and transparency settings for each tabbed window. As noted, there are a couple of unfinished edges, but overall, this is an impressive effort.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20030226023239292