You CANNOT answer this question.
 

Using PHP, how can you effectively take a "screenshot" of a web page? Any library will do, including the GD and PDF libraries.

I know it's possible but Google isn't helping.

your right i can't answer it :)

After extensive research I think there are only two options, none of which are acceptable:

1. exec IE, take a screenshot, and then use the GD library to work with it
2. Use an expensive ActiveX component to do it

Your not ganna start spaming me inbox with a screenshot of my site and a subject of "You can make 1000000 millon pennys if you add your site to my database" are you? ;)