show spaces at cursor in insert mode?

Hi,

I was watching this vim video

http://vimeo.com/moogaloop_local.swf?clip_id=14300874&server=vimeo.com&autoplay=0&fullscreen=1&show_portrait=0&show_title=0&show_byline=0&color=00ADEF&context=user:2555459&context_id=&hd_off=0&buildnum=4c89d

and there is a small dot that comes up next to the cursor in insert
mode when he is typing a space. Is this a VIM builtin, or is he using
something else?

Thanks!

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