Change the size of many images at once with automator for OS X

I have dipped my toe into "programming", and it's already saved me five minutes! Now I can take hundreds of images that are 2000 pixels wide, and scale them all down to a Web-appropriate 640 pixels in just a few keystrokes. Even the most computer-averse knucklehead can do this, and I'll tell you how.

As a woodworker who maintains a blog and a website, I deal with digital images and video more than I'd like to. Not that I mind showing off my work, and adding visual aids when describing a new technique, but I could do without the process of getting the images ready for the web.

The biggest hassle is changing the sizes. But now, after following the simple two-step directions from MacTips, all I do is open Automator and press go!

I don't know what's been holding me back.  I guess I figured it would be hard to find directions on how to do exactly what I wanted.  But finding the directions was as easy as googling "change image size automator os x".  I can't wait to try another one.