Kisrael,

I've been missing tabbed terminals on OS X since I started using it. I got hooked on them with KDE's Konsole, and KDE doesn't run terribly well on OS X just yet.

A tabbed terminal is fantastic for programming work-- I always kept konsole going with at least four tabs (usually more like eight), opened to various test machines and the like. The keyboard shortcuts make switching (and opening, and closing, and renaming) tabs a quick and simple process, and I don't have to deal with managing a fat stack of windows on top of my already fat stack of windows.

The advantages to tabs are speed, reduced clutter (a huge deal when you've got overlapping terminals full of very similar text), and visibility (the tabs show you which panes are open, where each pane is in the rotation, etc).