How to duplicate and snap vertices in repeating pattern?

I am modeling a simple ladder in Blender, and I want to repeat this group of vertices in a repeating pattern:

http://farm3.static.flickr.com/2445/3855451232_76a8efe5bf.jpg

But the best way I can find to do this is to duplicate, and move it up on the y-axis, then grab it again and y-axis move and snap to one of the top vertices of the original with the magnet tool.

This process seems to be more complex than would be necessary for the simple operation. Is there a way of quickly stacking the rungs?

Thanks!

Then you want an array modifier.

Best wishes,
Matthew

Thanks, I’ll definitely try that out! I once used that modifier, but of course I forget about it right when I need it. :o

EDIT: works perfectly! exactly what I wanted, thanks!