I'm not sure I got it right. What do you mean by a toolbar with just one icon?
But I'm aware that you can assign any folder as a toolbar in Windows 7's Superbar.
When you create a toolbar on either XP or 7, provided you have more than 3 items in it, by default the first 3 appear next to each other in the taskbar.
If you unlock the tasbar and push the toolbar to the left (assuming you have the taskbar at the bottom of the screen) you can close it down to show just 1 icon and the arrows for the menu.
This means you can put 2 toolbars in the same space it would normally take for 1.
I already have 2 toolbars on my PC's, Quick Launch and PPTP VPN's, now that I have VIndicator
I shall add at least 1 more on 7 for L2TP VPN's.
On my Netbook (XP) I don't have any toolbars because they take up too much room so I modified the folders on the right-hand side of the Start Menu and put the most used shortcuts there.
I have Coolbarz
hidden on the left of my screen containing shortcuts to various screen tools and Tray Commander Lite
in the System Tray with shortcuts to backup, cleaning, encryption, and LV programs.
The only shortcut on any of my Desktop's is for the Recycle Bin.