Safari feature

I'm sitting here in the dark surfing some sites and discovered, quite by accident, a new (to me) cool feature of the Safari web browser. I've never heard anyone mention it before. If you have links on the bookmark bar you can open them with the keyboard by touching the command key + a number (1 - 9). It will open up to the ninth link. It skips over any folders on the bar. Pretty cool if you don't want to use the mouse, it's faster.