W4it
A simple yet useful NodeJS module that provide Wait Sleep and other async funcionality
You can easily install by using Bower, a package manager for front-end components.
bower install w4it
you may also wanna check out this example of usage online Complete Node Version List
where it's used to sync two request to different sites and then mix up togheter the results
showing the complete list of Node Releases either coming from Node or IO.JS