I'm checking into the available methods for programmatically taking screenshots of an arbitrary website. For example,
Facebook:
http://clicktoverify.truste.com/pvr.php?page=validate&url=www.facebook.com&sealid=102
Salesforce.com:
On that page you'll see they have a screenshot of the referenced site.
What are my options for getting these kinds of screenshots in an automated fashion?
I'm primarily working with PHP, but am open to all suggestions.
Thanks!