Website Screenshot (HTML5 Canvas / Services)

Alright all,

Been doing a bit of research and want to know if anyone else has tried this... and what approach would you take.

I'm planning on doing a website which will display a screenshot of a website (maybe based on the url in someones email address).

There's going to be alot of people getting this so, pre-production of the screenshots isn't a solution.

Soooooo... does anyone know of any solutions:

1. Thumbnail service that builds on demand (no queuing)?
   


2. HTML5/Canvas script that will let me do this. I've found one but it won't run cross site.
   


3. Any other solution?
   

It'll be built in PHP.

Thanks

PVS.

Source: Tips4all