I have a love-hate relationship with tabbed interfaces. On one hand, they keep my taskbar clean. On the other, they merely scuttle my window-hoarding behaviors into a single window, where the mess grows into a pile of outdated, unused tab sessions (i.e., Firefox). I also have need for some types of programs to be opened in separate windows on a regular basis, such as SSH sessions, where I often work on multiple related tasks which have to be monitored simultaneously. In those instances, the number of PuTTY sessions I have open (and have disconnected) can quickly grow out of control, clogging my taskbar.
Here's a quick script I wrote to clean up any inactive/disconnected PuTTY windows: Cleanup PuTTY Windows